I don’t have an explanation for the issue you’re describing, but if the footage you want is on a microSD card in the camera and it’s important enough that you want to save it as legal evidence, then I would be strongly inclined to pull the card from the camera and plug it into a PC in order to copy and archive the important video files. Once you have the files on PC, you can use a number of methods to join the 1-minute segments into an appropriate video length for your purposes. One tool for doing this was created by Forum Maven @IEatBeans:
You could then copy the resulting video file to your phone if you need to have it with you on a mobile device, and (most importantly, I think) you’d have a copy of this footage saved elsewhere.
Regarding the weird thing for the time stamp and video skipping behavior, I think I read one post recently where someone reported that the new v3.0 app has resolved the skipping problem (at least for that user), but I’m unable to quickly locate that one at the moment (and there are way too many v3.0 topics!).