Sony STR AV 370

Question

Hello, I have an oldish Sony STR AV 370 receiver/ amplifier - it will work for a while and then stops producing sound and starts flashing a red "p" light. At this point you can also hear something clicking inside. turning it off at the wall for a while and then trying again seems to fix it. Sometimes it will work with no problems all day and other times just won't come to the party at all!I would be grateful for any advice you could give me.Jim