Freeze and reboot - LG Optimus L9 P760, P765, P768, P769

I have a lg l9 p760 with 20h rooted. Sometimes it freezes and then after half a minute it start to work again but its like it just finished booting. (scanning sd card, detecting network etc). Is this a hardware or software problem?
Edit: I also use hotplug governer when the screen is on and interactive when is off.

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[Q] i9300 strange freeze/reboot problem

Hi
I have an international model I9300. while updating the rom via odin, i had accidentally selected the repartition option and the flash did not complete even after waiting for over 30 mins. so i had no other option to pull the battery and reboot it. then i loaded stock rom on it but still what happens it while booting after the lock screen appears, it freezes. sometimes it does complete boot and i can use it normally, but when screen shuts off due to inactivity, it actually powers off on its own.and i have to power it on again for a complete boot. Then, i enabled the screen awake mode from developer options and put it to charge - strangely with the charger plugged in it never froze or rebooted, as the screen didnt go to sleep mode! I have gone through the SDS threads and also used the dummy file generator but no error while generating dummy files. I have tried I9300XXALE8, I9300XXEMB1, I9300XXEMC2 and I9300XXEMC3 and Slim-i9300-4.2.2.build.5 roms but all give the same result. also tried without SD Card and SIM Card - still the same problem. can anyone give me any suggestion on how to solve this please?

LG G2 problem after installing CMW

So I rooted my phone and installed cmw today.The process was successful only problem is that every time I boot, screen brightness automatically goes to 100%.I like to always keep it at a low percentage for baterry maintenance.Any ideas?
I also tried Gravity Box bu it didnt work.Screen starts with the birghtness I had selected and turns to 100% after 5 seconds.
No hope?

LG G3 wont boot up

Hi everybody,
I have an LG G3 running Cyanogenmod 13 with TWRP installed. A few weeks ago, my phone always crashed at random tasks and it wouldnt boot up on the first try. The crashes got more and more. After some time I set my phone on performance and I found out that by accident the 3rd core was deactivated, I had no problems from then on except when I had to boot it up. Because setting the phone on performance didnt always work I deactivated the core manually. Yesterday I shut down my phone because it was laggy but it didnt boot up again and the furthest I got was to the SIM PIN screen. Luckily I was able to get into TWRP where I tried to install the system again because it helped sometimes. At approximately half of the progress a green screen appeared (not the first time) with the option to boot into Download mode or to reboot. However, I still can boot into TWRP (sometimes) but it always crashed. Any idea how to deactivate the 3rd core using TWRP or how I can fix my phone on a different way. (Installing a custom kernel?)
Thanks in advanced

LG G3 Restart and Shut down automatically.

I have LG G3 (D855) and running stock firmware, Someday back my phone start showing invalid sim then i tried same sim with different phone and its working. Now i know there is some fault in phone, i was keep trying then after few minutes my phone restart with awkward loud beat and then shut down/restart to boot. To boot i need to take out battery but it still restart or shut down automatically.
I flashed my phone to stock KDZ successfully but still i am facing same issue. My screen sometimes stuck to LG logo or LG logo disappears and shut down (Need to take out battery to start my phone again), Boot sometimes to home screen then turn off. I flashed to D85530e_00_0927.kdz , which is stock i was using before any issue in my phone.
Please help me to fix my phone
Video: http://www.dailymotion.com/video/x6glqbb

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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