Harmon Kardon AVR151 optical drops out


Novice Member
I recently purchased a second hand Harmon Kardon AVR151 receiver.
The TV audio is connected to the amp with a digital optical cable and most of the time it’s ok but it does randomly seem to lose the signal - or it could be something else but the end result via the same. The amp just doesn’t play any sound.
I fix it by disconnecting the power on the amp and the optical cable for a few minutes and then it’s fine.
Any ideas on what might be causing that?
Optical cable is brand new.
Speakers are Bose Acoustmass series VI

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