A similar problem was happening to my phone. Essentially, it would keep on restarting over and over again. I followed the sony website and factory reset my phone, but it still happened. However, I found a solution:
-I deduced that the problem had something to do with connecting with wifi, since it finally stopped restarting when I told it not to look for available networks.
-I then resorted to looking through all of my network settings without turning on the network.
-I found that it remembered networks from my old phone, so all I did was click on each network and click "forget."
-After doing this, I was able to connect to my network without any problems. I then restarted my phone to ensure that it was fine.
-From this, I think the problem is that the phone is either that it was trying to use past network settings (from my old phone) that just aren't compatible with this phone or that there were multiple networks in the area that it remembered, so it just crashed trying to connect to both.
I hope this was helpful!
