Does anyone have any idea why the disc drawer will not open (either using front button or remote control) Occassionally it does open, but most times it does'nt, then I have to switch off & start again. The recorder is over 2 years old so no warranty. Could it be just dust? Sometimes it will open & then close again b4 I can put a disc in, & its driving me nuts!! When I press the "open" button a noise is heard as though its trying to respond, but it remains closed most times. I've had the casing off, but dont know what to go for, apart from vacuuming.