Z1 power off while I'm surfing though the battery is at the level 60%

[mrmima]

While I'm using the net, wifi connection, my phone keeps turning off even though that battery is sometimes at 60%.

Does anyone know the reason?

Thank you in advance

[MarlonUk1]

can you see if this happens while you are on safe mode?

if it doesn't it means that an app is causing the problem. try to see which app is recently installed or updated before this problem showed up