CD player cuts out

(((Try not to use alcohol or Windex on any optics you may have in the house, they do attack glue or glass, at least in microscope objectives. Get a bottle of Zeiss lens cleaner off Amazon)))

I fix Discmans as a hobby, and in most cases this skipping, more pronounced at the end of a disk, means worn spindle motor. Since CD drives for CD50 were discontinued decades ago, you may try to reset CD platter onto a new Mabuchi motor.

Alternatively, if only some specific CDs skip, then you are in a good company of "post-VRDS" Wadia owners ;-) learn to live with this glitch... You may find this post (at square-2.com) interesting:
THE GOOD, THE BAD AND THE UGLY. CD PRESSING QUALITY


I give up with the link!!! here is the address:

http://square-2.com/the-good-the-bad-and-the-ugly-cd-pressing-quality/

+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. 

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