I've had it for 6-8 months and it works well most of the time.

Hmm. I didn't realize you were talking about an intermittent problem. That could simply be a loose wire on the sled connector (or anywhere else in the system). Or perhaps a wire that's rubbing against a sharp metal edge somewhere under the upholstery. Or one of the pins on the connector not making good contact. Something like that.

Is this a Mark1 or a Mark2? If it's a Mark1, I'd say definitely clean the contacts on the sled connector, it could be that simple. My Mark1 occasionally had noise problems induced by bad connectivity on the connector pins, cleaning the pins usually helped.

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Tony Fabris