I have The v3 and live in Montana. It said it was ok for outdoors, but all of the sudden the motion sensor isn’t recognizing people at night and not turning on the light Any suggestions? Could it be because it gets below zero frequently?
Welcome to the Wyze User Community Forum @kmdegroat! 
Verify that the settings haven’t changed recently, perhaps w\ a firmware update. for motion detection at night, are you using the Color Night Vision or the IR Night Vision? Are the IR Emitters coming in at night?
You mentioned it turning on the light. Are you using this with the Spotlight accessory or the Floodlight?
What firmware version is the V3 running?