Spotlight cam black video only at night

My spotlight cam suddenly started recording black video at night. No issues during the day. The snapshots it takes every 5 minutes are fine at night. And if I live view the video is fine. It is only when motion triggers it at night. This just started happening. The wifi RSSI hasn’t changed and is acceptable. I have a second spotlight on same network with less of a wifi signal and it doesn't have the issue. I started linking the two so that when the one with the issue detects motion, the second one with less of a signal records. The first one has a black video and the second does not. This issue only started over the past month.