@Steve I have also experienced video locking up when using motion detect, specifically when using blobdetect. In my case the camera will lock up just after an event that changes a large part of the pictures, for example when my porch lights turn off at night and the camera switches to IR. The image will get stuck and I have to edit the video source and resave to start the image and motion detect again. I do have the scheduler set to 24/7 motion detect, I am running windows 10, and have two hosafe ip cameras. Currently running version 1.5.2 but have experienced it since installing the system about a year ago. The issue will happen with either camera/source, I have reinstalled and deleted all the appdata and it continues to happen.
I have not experienced this when using FrameDetect. (I keep switching back after I upgrade hoping it would be fixed.) I have not been overly concerned because I’m running it on a fairly low power box and had chalked it up to not enough cpu since no one else had reported it on the forum.