I have my C210 outdoors undercover (yes I know it's not an outdoor camera) and when it switches to nightmode it has what looks like rain visual effect and it constantly triggers movement however if i switch to day mode there is no rain and zero movement. 

Is my C210 broken? or is there a setting perhaps?

Firmware is lastest, I checked for updates.

Here's a screen shot to compare night and day (a video would be better but it's what I have for now)

The white streaks in the nightshot are all moving and look likes rain

Thanks!