Smartthings app does get past "loading" on my mini splits

My app worked with my mini splits seamlessly for months but now when I tap on a split to access settings, I get the “loading” notification for a second or two but then it goes away and I can’t access the settings.

I can see the unit, tell if it’s connected, whether it’s on, and the temp. But I can no longer access the settings on any unit (I can even turn them on and off).

Vexed.

I’ve read several threads about this but I’ve seen no solutions.

Help!