Interesting. My temps were fine I thought when printing the first few things, then seemed to do what you describe bouncing around a bit. The vid of the cap issue being sorted shows it moving around a few degrees before the fix and after the fix it didn’t move more than about 1c…
Last time I looked they hadn’t released a new working board and the ones being sent out (2.1?)had the same problem.
Talk was of them using a chinese LMP2596 chip in some boards instead of decent jap one etc which was the reason the voltage ripple was there in the first place which then needed addressing with bigger cap. The ones with a decent chip, even though they had an underspecced cap, had less ripple and therefore the new cap wasn’t needed.
Interested to see which board you have in your control box. I really need to check mine too.
Let us know what you find.
Obviously this may not be the prob at all mind you.
Like you, if I decide to change it, I will probably take to tv repair shop, even though i’m pretty handy at soldering. Can’t see them charging much and they are used to fitting smd components.