Access Virus C audio dropouts and harsh noises - always needs re-starting

[cloudswim]

Hello I recently acquired a second hand Virus Indigo 2 on OS 6.5.

Im having some weird behaviours, which I've also read similar incidents on the internet.

Basically I'm having audio dropouts and harsh noises and I would have to re-start the synth to get rid of the problem

When turned on initially, everything functions perfectly. It seems to happen when heavy memory is in use.

After a short period of time, the loaded preset sound drops out and terrible screeching high pitch noises can be heard. The machine is again OK after being switched off momentarily. Sometimes it stays working properly longer than others - there seems to be no consistency in when it fails. On some occasions it would occasionally just drop out (no sound at all) and would require a re-start.

Also sometimes the knobs are not reacting when I'm trying to change settings.

If you know these problems, I would be very very grateful if you could please let me know what is is. I have read about the same thing happening to other users.