My M4 Mac mini overheating and freezing after upgrading to macOS 26.1?

I have an M4 Mac mini, bought last year: when running macOS 15·x

After upgrading from macOS Tahoe 26·0·1 to 26·1, I’ve notice the occasional freeze when lots of apps are open.

And that the thing seems to over heating: far more than it did under 26·0·1.

Does Anyone know what’s happening?

Or how — bar rolling back to 26·0·1 — to solve this?

[Re-Titled by Moderator]

Original Title: Overheating Mac mini