Maybe its a brick,the condition where the installed program crashing and uncomplete on your devices,try to recovery mode or bring it to LG services centre
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My phone lil bit lagging after install it,google play services background eat my mobile data until 509 mb,3G watchdog error and crashing,my opera mini can't display image,gallery is gone,my battery reduces so fast
Sent from my Nexus 5 using Tapatalk