Don't know what happened to the video, exactly. Errr.
Couple theories. No matter what we do, recoil wasn't part of the DVR specifications. Since you were using the MDVR and probably used the UNV cable prior to using mine, those little recepticles inside the DVR are weak and UNV for whatever reason sells cables with 3 ring 2 pole connector when in fact the MDVR and all others use a 4 pole 3 ring connector and that may stress the recepticle even more.
In order to eliminate the possibility of it pulling out if that was the case, use a rubberband to hold it right. I have not last video using my DVR, but don't have a many recordings as some of you, I did lose a coyote video with the MDVR.
You would think that if you had the plug facing you that upon recoil that it would push it in further. So I may have another theory, it may not be the cable, it might be the SD card losing connection during recording and recoil. This is most likely the issue.
I believe it doesn't move in/out causing the lost connection, it just moves around. There are a bunch of pins. If it loses almost any of these it will lose the recording. Each connection is just a standard spring clip, doesn't take much force to move them :
I can do some testing to see what happens on the bench. The only fix I can see is putting tape on the back of the SD card to make a tighter fit. May want to try next time. Probably just a piece of scotch tape.
Could be either the cable or card losing connection, but hard to tell, both cheap connectors in these DVR's.