Z3 Compact restarting unexpectedly, probably related to WiFi issues [after lollipop]

Hi!
Got my Z3 in March 2015. And there's 20 days or more since I upgraded to lollipop. Since then, apart from a little bit slowliness in the beginning, everything was alright.
Just after I got the feeling of lollipop and found almost all configurations settings I used to have in kitkat, it got me this problem:
I observed that my phone began to restart randomly with no reason.
This happened when I wasn't at home, walking around the city centre.
Then, once getting out of my house, right after my home WiFi got out of range, it restarted. Then, I realised it could be WiFi related. And, in fact, whenever my phone found a known network and (I assume) tried to connect automatically (since this function is enabled in my settings), it restarted.  As soon as i get home and it also tries to connect, boom! Restarts.
And at this moment, I am at the university and it is restarting all the time. Sometimes it quickly shows the home screen, but shortly after restarts again. 
I tried to do the hard reset (press power and volume up until 3 quick vibrations) and pressing the restart button for 5 seconds until 3 quick vibrations and none of this options seemed to get the phone out of this loop.
What shall I do next? If you only suggest a factory reset, is there a way to do that even if I am not able to get to home screen? Can you give me one link explaining how can I easily back up my data and apps and then restore them after this factory reset?
Thanks a lot!
Gabriel

I restored the phone with PC Companion and it retrieved an error, highlighting in red the part that I shouldn't connect any other USB device (which I didn't) or move the phone because it could disconnect accidentally. It may have disconnected during the update...
But I turned it on, then it stopped at the loading screen with the waves. Did the soft reset and turned it on again. Showed the screen updating apps and everything went alright, I hope.
Now, so far so good. Still no random rebooting. If it appears again, I'll post it here.

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