XZ freezes and gets warm after internet use, System UI stops.

[mavande6874]

On Android 7 my XZ is getting trouble with the use time, internet, laggy response, crashing software and finally system UI not responding anymore.

There were troubles and solutions with Android 6. These solutions don't work on 7.

Any other solutions?

[Akashv0444]

Repair using Xperia companion

[mavande6874]

In companion I get an error when trying to repair the software. Some UELoginAutenticationFail appears near 2/3 of the initialising.

Don't know what to do.....