I would also detach the panel and reboot the cam, then re-attach panel. If the camera battery has gotten low, charge it via USB first and then put it back on the panel. I’ve seen both of these “tricks” work.
I assume you don’t have a second cam but if you do, try swapping out and see if you get effective charging on the other cam. I had an outdoor cam battery fail randomly and I thought it was the new panel. (That camera charged ok on USB at first but not on panel. Slight voltage differences, I assume.)
I had some real finicky problems with my panels to start but some firmware update on the cams appears to have addressed that. I haven’t seen any issues in months. (knocks on wood)
Edit: Removed my first suggestion after I re-read the OP’s first post.