Just setup the system today, it worked fine for the first 30 minutes of playing a BluRay, so I powered it down happily. I returned with a optical cable to get the tv audio hooked up and all was well for about 10 minutes then the system shut off. I tried powering it back on and get "Please Wait" then "F61" and it shuts off. Panasonic will warranty it but I need the proof of purchase, and I bought it from someone else and dont have it. Did I just waste my money on a 3D doorstop?? Help!?