Weather has been unpleasant lately, so not great for diagnostic work.
Not sure if photos work w gerry, but I attached an in-tank photo.
Surprising amount of grit in there, and some on the in-tank filter.   This has me a bit baffled.   I installed this tank about 2 years ago and thoroughly cleaned it at that time.   So I have no idea where it came from.
I doubt this is blocking the flow on the tank filter, but the mesh is very fine so maybe?
I will clean the tank as best I can, then use my spare pump and a new filter out of an abundance of caution.
I now have a pair of (hella) temp2 sensors on hand and will replace that if the issue persists after the fuel supply work.  Which it most likely will.

I'm also wondering if the ignition switch could also be a possible culprit.  I've only been driving it during the day leading up to this so I may not have noticed lights blinking, etc.