My AVR350 has started to play up in the past few days. The AVR350 is set to bi-amp the front spekaers. On occassions, especially on the first power up of the day I lose the front right speaker. The volume is very faint and if I send a test tone to the speaker the volume is very, very low. If I the turn the 350 off and on the volume comes back. The front speakers are Spendor S5e's. This is a very intermittent fault, but I was wondering if anybody has had the problem, or new if it was a common fault. BTW I have checked all cables for shorts.