iPhone reboot or turn itself off after auto-lock
So I have an iPhone 6S 64gb bought from eBay. The problems are:
- it would reboot or turn off after lock screen
- can’t update via iTunes(error 9), 3uTools(error -1) or even on iPhone but I can restore it.
- phone heats up quite fast
- battery and LCD have been replace but still the same symptoms
So I suspect is a hardware issue related to the motherboard but where and how much will it cost me to fix this.