This is my first posting and I am a bit of a audiophile pleb..so please excuse the ignorance. My AVR 300 (DVD 79) worked brilliantly except for the normal concerns as to how hot it run and the apparent low volume. Went away for 3 days and turned on the AVR and it seems to be playing up. Whilst playing CD's using DVD-A and Direct on....it plays through all 5 speakers (incl sub). I thought it should only be in stereo. When putting on DVD's and using DVD mode, it plays for approx. 2 minutes and then appears to be searching for the format. Sound goes off, crackling develops, garbled words and then it appears to move from DTS to Dolby 5.1. optic moves to analogue, then comes right and then the whole process starts again. I dont really know whether I have done something wrong but it appears that something has fried in the AVR...any advice would be appreciated. Kit I have is Arcam DV79 and AVR 300 using Atlas digital coax interconnect, Sony 510 recorder, Quad L series speakers (4X12L, centre and sub).