A problem with Philips HTS3544

As I watched "The Tudors" last night on DVD, I was wondering why on earth they decided to shoot Episode VIII in full screen format, as opposed to wide 16:9. Turns out, the settings on my Philips HTS3544 became reset for no good reason. I had to change the setting for the output TV from 4:3 to 16:9. I only got around to changing a few other settings that I had previously customized. At least I did not have to worry about surround sound speaker placement with speakers mysteriously jumping from place to place. But my volume settings for each channel became reset as well. Sure hope it does not happen again!