Just recently got my Z1 back from service... Every now and then the units screen will not power up, but I can still hear the music and radio. I called the guys who did the work and they instructed me to upgrade to a Z3 HDD, but problem still occurs. It sucks because I have to reset the unit when it does this and this knocks out all my AV settings!!! Any suggestions???

I have not heard about this issue... New to me.