Hi, I am using an Acoustic Solutions DVD 551 as a second player in the bedroom. It has just started 'locking up' after playing for about 15 mins. It powers up ok, starts to play and after approx 15 mins the picture on the tv is like it is paused. You cannot access the machine at all by any buttons other than the power button - stop, menu etc.. just don't do anything. When you power it back on it is still inaccessibale and only loads a disk again after being left for another 15 mins or so. This is true for several different disks. The unit is 18 months old, little use, bought from RS. I spoke to them and they said they'd have a look for £35 - yeah right !. Any ideas or advice on what to do ?