Teac A-H300 Amplifier (by 2 users)

A recent problem has occurred whereby when I switch on my system(amp, CD, TAPE DECK, DAB tuner and analogue tuner) as soon as the amp has warmed up (3-4 seconds) within 1/2 a second of sound coming from the speakers, the amp cuts out.

The amp itself locks up - unable to change inputs, etc and the light around the standby button flashes. All the other components remain active and fully operational (as far as I can make out). All I can do is switch the system off via the remote or the standby button on the amp.

I've disconnected the power and reset the amp using the master power switch - but to no avail!

Referred to the manual - but no help - anyone know what might be going on????

Thanks,

Steve