I've had a Marantz 4100 OSE for a couple of years and it has recently began to misbehave. It will play a disc for a while then it stops and comes up with "disc error" on the start-up screen. I've tried cleaning the lens with a specialist cleaning disc but the fault is still occuring. Anyone come across this problem before? Is my machine on its way out or could it be that the laser needs re-aligning? The machine has only seen moderate use over the past two years or so which adds to my confusion over its ill health. Any suggestions?