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See if turning off 'Send Usage Info' in SETTINGS»About Phone»Usage info settings, does any thing helpful
There's another menu option its linked to in the Sony Diagnostic App, but I can't remember the title and I won't be able to tell you because I've removed it on my phone so you'll need to take a screenshot in the Diagnostic App to refresh my memory if you want to check if it's turned off there too
I'll need to wait until the image gets approved. Or you could post it up on imgur or something
Next thing to check is if the Sony Enterprise and devicemonitor services have stopped
Check the Device Administrators and temporarily Enable anything Sony related if they are or have been disabled