Mesh
You're a lucky man!!
Sometimes, it's just a matter of the PC's internal components getting along with the audio interface........other times, it's just me. 
I just fear change, then go mad and change everything
I still have the XP machine. My friend's son built it for me 9 years ago when he was 16 (bright lad).
Here's the thing though - I NEVER allowed any updates on that machine, it never let me down, and it's still running now, albeit at a snail's pace.