Front and Garage Camera is storing motion videos except the Backyard Camera

There are 3 cameras in the property and we are still under Ring plan, 2 of them is working alright, we are getting recorded motion videos, except for 1.It stopped storing or recording motion videos. The only way we can check the area for now is through live streaming. The said camera has been not recording or storing videos since 11/17 and it's been 5 days now where it hasn't recorded or stored any motion videos which is very unlikely. Can you help us with this please, ASAP??