This sounds like the same problem fyijacque was having 10 years ago in the posting above.
This player has been discontinued & out of production for about the same time (10 years).
Additionally, there is not even a user manual or firmware update posted anywhere here on the forum or on SanDisk’s support page on their website. It is essentially, the orphan child that has been forgotten.
If the solution posted by fyijaque doesn’t solve your issue, the only thing I can recommend is give it a decent burial (recycling) and move on with another newer model. Nothing lasts forever.
