Same thing happens here! Solver started to kill Rhino. Sometimes my .gh file does not open at all and if it opens the next time solver has to do something a bit more tedious it just zaps Rhino away. Everything worked fine before the last update.
Next I’ll try the file on another machine with less grasshopper plugins and see what happens.
I went to the april version with Time Machine and now it started working again!
I restored the following to the time before I updated: /applications/Rhino 7 /users/…/library/application support/McNeel/Rhinoceros