Hi. 34ford
i think your problem is your hard drive…. If it’s been used for 8 years then it is at the end of its life
with your new recorder …Ai -H265-audio-4K it’s a lot of data …. A hard drive of 8 years will look as if a format cleans it up we’re the fact is it does not ….. it only passes by the bad sectors and the more bad sectors make it hard to wright to. You can’t put a hard drive back to original it will always have data on it