The Mono out jack on my Technics has been feeling loose for some time. That is, it has little resistance when plugged in. When on a gig yesterday, I noticed a lack of signal, momentarily. I plugged it back in and it was fine.

I am not sure if it is a mechanical problem or needs cleaning with CRC or something. It would be easy enough to spray cleaner in there but I wouldn't be sure until it happens again.

What would be your best guess ?

Bernie