History stopped logging...Help!


My Prime 4 has been working fine logging history, which is quite useful as you can just jump back to the last time you were in a venue and use the history as a good starting point for the night. However, my Prime 4 has stopped logging, my last few nights I noticed are missing from the history!!! Very frustrated.

Is there a max number the Prime 4 can store maybe, do I need to start deleting the oldest or unwanted ones or is there something else going on here.

For clarification there are no other issues.