This question was posed on the forum 6 months ago. Front speakers cut out after an hour or so. Can hear switching sound from amp. Have removed amplifier from TV unit as thought could be over heating, but still occurs. I've just found the answer. The connections for the relays for the front speakers crack on the board. They are just behind the RCA sockets on the back. Resolder them.
I have been scouring the web for this fix and you seem to have had the EXACT problem that I have rhodesy. Can you expand a little on the fix? What are the relays? How many are there? What colour and size? And how many did you resolder to fix the front speakers? Cheers if you can help