Curious if anyone else has had issues with replacement belts for Marantz CD players not lasting.

So few years ago my Marantz CD7 had door opening and closing issues, the belts. The belts were replaced by an engineer I know and trust. He ordered belts, fitted them and everything worked. I had a Marantz CD94 mk2 serviced in the same way before the CD7 was.

So yesterday I fancied using the CD7 and it has the early stages of belt issues, drawer not opening fully and needing a hand to close and a few times it will open again. It plays CDs perfectly. Slightly frustrated I got out my CD94 and it has complete belt failure.

I am amazed that with minimal use, careful storage that the replacement belts have gone bad in such a short period of time.

Anyone had these issues? Is it because I am not using the CD players very often. Any ideas?