Stick up Cam: Footage Unavailable

Hi All, I'm a new ring user, have three stick up cams (outdoors and solar powered), version 3 doorbell, chime pro. Of the three cams, one will always give me "Footage Unavailable" where the others show the snapshot images (set to take every 5 minutes). It seems to work for a couple of days after a reset (of connection change from chime pro to WiFi or opposite) and then stops again. I can go live, it detects motion and records, just no snapshots. I did a full factory reset the last time, have tested it on WiFi and the chime pro network (same results). My WiFi signal is fine in the location as can be shown by both a WiFi test and the fact that live view works and motion gets detected and recorded. Any ideas are very welcomed at this stage. Kind Regards, Brett