Hm.. this is not so easy, here are my results of the 3 day testing:
1st day: All files have broken seeking, time is jumping all the time.
2nd day: Most files have broken seeking, time is jumping, but the files which are still recording (not closed) are OK (seek, time), just one file has broken seeking and time one time, then it was OK - all this while recording.
3rf day: All files are OK - seek and time.
This is really strange, because I have not changed any option in VLC and I have not changed the files.
The files are too big to upload (from 5-10GB), but I'm still testing and I'll report any changes and try to upload the file.