I own a Z1 C6903 running KitKat 4.4.2 not rooted and locked BL
A couple of days into installing the KitKat update, I gave the phone to my dad who borrowed it until a week ago. He noticed that when holding down the power button and select the power off option, the click yes to shut-down thingy didn't pop up so the phone has never been switched off for over a month. The phone also ran extreeeemely slow with camera app on 4.3 loading in less than a second but now taking over ten seconds simply to load the app, 5 seconds to open up the camera and crashes out all the time. Free RAM has dropped from around 1GB free to less than 500mb at times. I used the repair option in PC Companion which worked so the phone could switch off and the phone ran smoothly (I used Helium Backup to backup my apps before doing the 'Repair' on PC Companion) until the next day where it had the same issue. The camera now just won't load at all and I'm stuck. Free RAM is less than 200mb. Bearing in mind I'm not rooted and running bone dry stock, what can I do to fix this? I need a working phone fast.
It was because of corrupted data (after update).
Wiping data should fix that problem.