Originally Posted by St.Jimmy90
Umm, you could try to repair the software via pcc. If that doesn't help I'd send it to sony... Idk where you're from, but you should have 2 years of warranty
Well, PCC is the first thing i do, then flashtool. I am from UK, really, xperia z have 2 year of warranty? Awesome thx i didnt not know that.
PCC reduce the frequency of the problem but it still appear. My phone is untouched in terms of the bootloader