Sounds like an intermittent electrical wire/connection issue inside the table. That would be a defect!
If new, I'd take it back to the dealer to assess and address the problem, including making sure cartridge setup including wire connections is good as well. There should be no intermittent noise issues that result from jiggling wires (within reason).
In lieu of physically taking the table back to the dealer to address, I would lean towards contacting the seller to return, and see what they can offer up in terms of customer service to your liking from there. COuld range from tech support coaching you through, to a flat out return or exchange, whatever is needed to make a happy customer.
If new, I'd take it back to the dealer to assess and address the problem, including making sure cartridge setup including wire connections is good as well. There should be no intermittent noise issues that result from jiggling wires (within reason).
In lieu of physically taking the table back to the dealer to address, I would lean towards contacting the seller to return, and see what they can offer up in terms of customer service to your liking from there. COuld range from tech support coaching you through, to a flat out return or exchange, whatever is needed to make a happy customer.