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Repair the phone with XC and report back
Alternatives on How to backup Xperias
Hi @Muxis,
Welcome to the community,
I am sorry to hear about these issues.
These issues could be caused by a number of different factors, the first thing I would suggest would be replacing your SIM card and then removing the SD card(if you have one) from the device for a few days to see if the issue continues.
Let us know how you get on.
After repairing my phone with xperia companion and trying to remove sd card today the phone again restarted.