Advice needed please...

I have a Yam RX-V665 and have been using it for a 5.1 set-up
over 5 years and recently some niggling problems have arisen.
Sent for a power supply replacement a month ago and now
the sound goes off for no reason and only comes on when I switch
off the main power supply [usually I keep it on standby].

Should I retire the unit and get a new one?

Or keep on sending it and lighten my wallet?

TQVM for future advice.

Tweedled with all the parameters n suddenly it worked again...Lazarus effect I hope...But sometimes the speaker icons will vanish with the sound...then I operate again n works again.
Now to see how long it will last!

Will dump the Yam if it still cannot hold my manual decoder settings ~ then it must be mamaboard failure. Makes me so fed.up n frustrated!

To Desa HT I will go for some auditions...n hope to get at least 12 int.free payment plan.