LG G4 and V10 lagging - Android Q&A, Help & Troubleshooting

Hello,
I post here because the problem exists in both phones, LG G4 and LG V10. Recently my LG G4 start lagging. I mean when I type on viber a message then suddenly the keyboard freezes and after a few seconds the word is completed. When I delete a word, it takes some time to delete. Also when I click the task button to see open apps or the home button, it takes a while to respond. The same happens on scrolling facebook it lags and it takes some times to unfreeze. Clearing the apps doesnt work, I have to reboot. That happend to my LG G4 but I decided to move and buy a brand new LG V10 which goes super fast but it also has the same lag issues after few days of purchase. When I setup LG V10, I didnt asked to restore apps from LG G4, I made a fresh device setup. I installed only normal applications like facebook viber whatsapp instagram banking apps and swiftkey. No launchers no root nothing. Both devices are in latest android 6.0.
I cant understand what is going wrong and I dont see any more the option to view the running apps so I can disable some of them running on the background. I found an application wakelock detector but it requires root.
Do you have anything to suggest or anyone facing similar problem?

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aftergr said:
Factory reset the phone then try again
Click to expand...
Click to collapse
I've already tried, many times, but nothing..

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hex_messer said:
Using my LG GPAD 7.0 on latest stock ROM (Lollipop, rooted by kingroot) i see one annoing thing: when i switch between apps, even though to basic lock screen and unlock to app, it seems like app starts agan, not just unfreezed and instantly showed last state. I.e. page in browser is reloaded, session in online banking is restarted, book in reader is reloaded with some delay... On my prev. Motorola Droid2 with Android 2.2.3 switching between apps was smooth -- apps seems to be cached and when i switch back to prev app, it show previous state without any time delay and signs of restarting.
Is this situation normal for Lollipop? May it be problem of some settings, or it because of kingroot, or maybe it's a nuances only of this ROM?
Android 5.0.1, Kernel 3.10.49, sw. version LK430ZV4
HW: LGLK430, LG GPAD 7.0
Click to expand...
Click to collapse
There are many reasons it can happen:
1. It also happens when your browser does not keep the information. (You can change your browser)
2. It can happen when you have too many apps running in the background.(it's usually this...)
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