Out of Memory Exception Shuts Alteryx Down

[hellyars]

Alteryx has generated "An out of memory exception happened." event on more than one occasion the past two days.

I tried manually setting the Memory Limit to 18GB. That did not work.  It had previously been set to default.

System has 16C(32T) CPU and 32GB of DDR5 RAM.  At the time of the crash Adobe and Tableau (multiple windows) were also active. 

But, Task Manager showed only 42-48% of system memory being used.

What could be causing it?