sMaex

Hey Guys, I just found my Sony MZ-R900. Luckily for me, it still plays (with some cheesy 2000 trance ). But only if iI hold it sideways. If I lay it flat on a table or in any other angle it wouldn't recognize the disc. What confuses me about this: if I insert the MD, hold the unit sideways and than lay it on its back it will still record. So my question: Does anyone have a clue what could cause this behavior? Can I do anything about it? Im kinda scared that if I take it with me it will break completely. Thanks and sorry for my crude english.