CD player cuts out

+1 for checking sled gears and sleds, if you are lucky that's might be it!
Forgot to add: before opening anything check how it plays CDR and CDRW first, it may give you a better idea on what is going on. 

Thanks all!

@sevs it plays CDRs mostly fine. Sometimes a CDR will give me an Error upon insertion, but if i reinsert the disc a couple times it will read and then play fine. 

Does that that tell you anything?

I have one Eno CD that frequently gives me an error upon insertion, but I believe this is due to the early 2000s anticopy-protection embedded in this disc. 

Check CDRW just to be sure that laser is still strong.  There is a good chance that nothing is wrong with tour CD50: my Naim CDS3 also does not like CDR and sometimes skips on badly pressed CDs, unplayable by Wadia. And my CDS3 gets a new laser mech installed by AVOptions every 3-4 years (yes, I play it to death!).

once it gets worse, open it again, clean/lube sled rails, clean CD platter and puck, put a droplet of oil on the TT motor spindle/brass bushing (syringe with 20+G needle usually helps here) and there is a good chance that skipping will be gone for awhile

which Eno album? I will check it on my setup 

Cool - thank you for the ideas! I will pop the top and take a look at the rails. I’ve noticed if I try to select and play a track from the end of an album, the player will sometimes give me an error - however if I start the same cd from the beginning it plays fine. Perhaps this is also a problem with the laser moving along the rails. 

The Eno CD is Another Green World DSD remaster. Thanks!