[Q] USB connection problems, freezes until restart - Galaxy S II Q&A, Help & Troubleshooting

Hello.
I'm having an issue with my I9100.
What's wrong:
- the phone reacts with connecting it to a charger/usb with lag, it recognizes the connection and disconnection after unpluging after +/- few seconds-1 minute
- usb connection with PC doesn't work until restart, after restart I'm able to connect once and everything works fine until disconnecting, after disconnecting, the "connected as media device..." message on the toolbar remains, the usb doesn't react anymore until i reboot, but I'm still able to charge, connection via Odin in Download mode doesn't freeze and works fine every time
- have had having issues with overvoltage, when 100% and still connected to charger, the touchscreen feeled "funny", wasn't as exact as usually, was flittering aso., after disconnecting, the problem was solved
- after putting the battery out getting bootloop, no matter which rom, only thing, that i'm able to do then, is to switch into download mode and flash new rom via odin
what have I tried:
Full wipe with flashing stock samsung firmware (XXWLS), reinstalling usb drivers, cleaning the usb port with air, didn't help.
Anyone has an idea, what might cause the problem and how to fix it?
P.S. Now it doesn't recognize, that charger is unplugged after charging. Chared it 100%, disconnected, but the message "battery charged..." remains after disconnecting.

Anyone?

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[Q] Phone shutdown when USB is plugged in

Hi,
I flashed my phone to stock using Odin and this issue started.
Whenever I plug in the USB cable, the phone shuts off, it cannot be turned back on with the USB still connected.
Is there any way I can flash it to correct this issue?
Thanks!
EDIT: FIXED! I just had to work my way back to CM 7.1 to fix the issue.

[Q] flyer running cool3dhoneyV6 usb option problem

im using cool3d honey V6 since many days, few days back onwards im facing the problem of detecting usb connection to pc, if i connect original usb data cable it is simply showing the charging indication. i flashed again and re installed the rom, problem repeats again. im unable to connect my flye in disk drive mode, its showing nothing when i connect its simply charging guys what to do??
Try going into recovery and clearing cache and Dalvik, then reboot. That clears this bug every time its happened to me.

[Q] Vodafone Smart II probably bricked

Hello i have recently updated my ROM but sadly something happened with my service, it just said "no service" and i wasn't able to receive or take any calls so i installed this rom again from the recovery, and then when i rebooted this device, it suddenly stopped on the green goblin logo loading screen and my device was unrecognized by a PC, recovery didn't work... so i tried a RoFUSiON which can install a rom through the pc but my device, as i said, wasn't and isn't recognized anymore. What i can do? i can't even charge it, last night i connected it to the charger and let it on. When i woke up and unplugged it, it had no battery! probably it wasn't chargning, it was discharging, and the only way i can turn my mobile on, is plugging it to the usb, doesn't matter if into the power socket or usb-to-usb, even the screen lights up without the battery but still i can't go to the recovery or fastboot (probably, because as i said my device isn't recognized so either that's the problem either fastboot doesn't work). Here's also the video about this, maybe someone can help me since i don't know what to do.. thanks in advance.
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Samsung GT-I8552: Unable to access recovery mode and battery issues

Hello,
I'm using GT-i8552 stock 4.1.2 (UNROOTED).
I did root my phone with 'Framaroot', the rooting was successful and SuperSU was installed properly. After this I didn't try installing any custom ROMs or any conflicting apps but still I started facing battery issues like,
1. After putting on charge, display shows that it is charging but no progress at all (it freezes at certain %)
2. When the phone is switched off and put on charge, the display just blinks up and goes off (lights on lights off) nothing else appears and no battery progress
3. Sometimes the phone charges properly to 100% but after disconnecting cable, battery status is 50-60%
The above problems occur not all the time.
The things that I tried,
1. Did unroot my phone and removed SuperSU
2. Did a factory reset from phone's settings option.
3. Got an original new battery from service center
4. Took the phone to Samsung customer care (they couldn't find any problem at all and advised that the problem must be in the charger) (I tried to charge with samsung charger, sony's charger & portable charger)
5. Changed USB cables for charging
6. Tried Battery Calibration apk by Nema
7. I think the charging port is little bit damaged but I can still get the phone to charge
Even after doing all the above things the problems still occur sometimes. Other than that the phone works fine, there is no BOOTLOOP.
When I try to boot it into recovery mode (volume up+home+switch on and release after SAMSUNG logo) but after releasing the buttons the SAMSUNG GT-i8552 logo appears and phone starts with no warning and all, it's not accessing the recovery mode or download mode too.
Is there any solution to the battery related issues or do I need to flash the stock firmware again?
I am not aware of the steps of flashing firmware, please do redirect.
Thank You!!

Underclocking failed, need help!

Hopefully someone can help me
I tried a custom ROM (Lineage OS 14.1 based on Android N) on an old SD810 phone. It was working fine, however, it was hot (usual SD810 issues).
To resolve this, I installed "Trickster MOD Kernel" to "lock the CPU frequency" between 384k to 1.5m ++. It was working fine in the beginning, but after a few hours, the phone randomly reboots to a "battery sign", as if you were charging the phone whilst it was turned off. I tried installing the stock ROM (based on 6.0.2), however, it was still shutting off. It became way worse, to the point that you cant turn on the phone if it is not connected to the charger. I tried reinstalling the "trickster MOD Kernel" and remove the CPU frequency lock, but it was stuck to "ON". I tried lowering CPU freq to 1.4m++, and rebooted the phone, which rendered the phone unable to turn on even if the phone is connected to the PC's USB Port (it only turns on when connected to a charger).
At the current state, the phone still turns on at the TWRP Recovery and fastboot mode if connected to a charger, but if it is connected to the computer's USB port, it can only turn on via fastboot mode.
Phone stays ON if it is on fastboot mode, not connected to a charger/USB port
If the phone is turned on normally or on recovery mode, if it is not connected to the charger, it reboots to a battery sign as if you're charging the phone whilst turned off (again, the phone is not connected to anything at this point) then beeps twice and loops to the same battery sign.
Please enlighten me; is the issue caused by playing around with the kernel/CPU frequency? Or is this a battery issue?
So far, what I've done is:
1) reinstall LOS ROM, reinstall Trickster MOD and remove the CPU freq lock -> Does not work, still not able to turn on when not connected to a charger
2) wipe everything
3) install new boot.img from the stock ROM

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