Spotlight Cam Plus Battery - IR filter issue

I have had a Spotlight Cam Plus Battery for about a week. In the last couple of days the IR filter/night vision seems to not be working properly. When I go into the app and the cameras take a snapshot at night, the Spotlight cam is dark. It remains dark if I go into Live View. Then if I exit and go into Live View again, the IR filter seems to then be on. There is also a delay in the IR filter coming on if it detects motion, sometimes it doesn't come on at all, sometimes it takes 30 seconds. I have tried: Rebooting multiple times Re-connecting to WiFi Removing the batteries Tapping the cam Shining a light into it Toggling on/off Colour Night Vision The above seems to solve it for 10 minutes or so then it reverts back. WiFi strength is showing as green. Any ideas what it could be/what to try, or is it likely to need replacing?