ATEM Mini Extreme to Restream

We have been streaming for some years with an ATEM Mini Pro, and are now switching to an ATEM Mini Extreme.
But restream seems to have some issues with the new
mixer. I have been updating stream keys and trying different things, but nothing helps.
Any tips?

I have to keep my Extreme on a chill pad, otherwise it'll begin to buffer after about 20 minutes. As long as the unit stays cool it runs pretty good. You'd think the designers would include better thermal protection and maybe a fan or heat sink.