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Hi I have a sony Z5 compact, i have the screen replaced and now the phone says to hot turning off within 30 seconds off being on, you can turn it straight back on and then it does it again, has anyone got any ideas on what it could be?
@Marcus172 was the phone doing this prior to the repair....did an authorised Sony Support Centre do the repair 
If an authorised repair i would contact them.....
Hi it didn't do it prior to the repair, also she didn;t tske it to sony it was to a 3rd party, do you have any idea what could be causing it?
@Marcus172 you could try either running it in Safe Mode but unlikely a 3rd party app is causing this but you never know, also try a System Repair with Xperia Companion but to be honest in my opinion i would take it back to the initial repairer & have a word & explain what is happening since the repair
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
http://support.sonymobile.com/global-en/xperiaz3/tools/xperia-companion/
Thanks for the reply, I have taken it back now (4th time), so hopefully thi time it's fixed