Xperia Z1 keeps turning off

[LadyofLight]

Hi, my Xperia Z1 keeps turning off while the battery is nearly full (60-80%). It would suddenly claim 0% and turn off. When it's connected to the charger it will be 100% again in no time, but later turns off again. Am I the only one with this kind of problem? Is there a way to fix it? Please help. I'm already using Stamina and low battery mode, but it doesn't help to keep the phone alive.

[Uliwooly]

@LadyofLight

Repair the phone with PCC and report back

software repair

PC Companion (PCC)

Bridge (for Mac)

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355

[Criteria]

The phone is already >2 years old, the battery is aging. I suggest u to chnage a new battery for ur phone. 
Most people are having the problems with battery and are solved when the exchanged a new one

[Necromancer · Accepted solution]

I had the same problems. Sinply change the battery and everything will be back to normal.

[LadyofLight]

Ah, thanks for suggesttions)))) I'll try))

[LadyofLight]

Guys, I changed the battery and the phone is back to normal)) Thanks for the advises ^_^