Troubleshooting Linn integrated

Hi-I have a Linn integrated amp from the 1990's. It sounds great, except for the fact that it temporarily cuts out (still on, no sound)after sustained listening. If I let it sit for a couple minutes, I'll hear a "pop" at the speakers, then it is ready to play again, with a quick "off" and "on" with the power switch. Thanks!
Does the amp have a time delay on power up that cuts off the outputs? Sounds like something in that circuit is failing when the amp gets warm and disconnecting the output. The pops may be DC offset voltages the appear on turn on.

Provide some more detail on how the amps works if you can.
Sounds like a cap or transistor is failing...