Conrad Johnson Premier 17LS preamp shuts off

Hello,

I am a happy owner of a C/J amp system (also includes a Premier 140 amplifier). However, since the very beginning of the life of my system I have experienced issues with the power shutting off after a while. I had the system repaired at a shop here in Paris, but after a couple of years the power started getting off again. Usually the led lights are also affected and start to blink and lose strength. Now it won't turn on again for even a short time.

I tried several things including earthing the chassis of the preamp with no satisying results.

The system is seven years old (but that might not matter much, given that the problem occurred pretty early). We use it moderately (very other day we might listen to a couple of CDs). It also has a very low hum (we can barely hear it).

Any help would be greatly appreciated. At least I could steer the repair shop towards a more durable solution...

Regards,
Antonio