I came here to post the exact same issue, Samsung C series TV here.

MKV files are skipping to the next file anywhere from 10-30 minutes into the file. For me it's happening more often than not, although not everytime. I've just had to give up on a file by the time it skipped a 4th time.

Also in addition I am now finding all MP4 files have audio sync issues until I convert them to MKV.

Seems from the other posts that this may be a real issue and not just isolated to the OP.