I don't know if this is the same problem because I did not think my issue arose from updates . I'm running a 2018 MB Pro 13" with 16gb of ram with V. 15 Pro. I do a lot of document/spreadsheet/pdf work and often have many, many windows open at once in the VM. There will come a time when things begin to slow down to a crawl and before I can do anything the VM goes black. I've figured out work-arounds to save some of the open work and close open programs, but once it goes into this spiral it's basically hopeless and I have to restart the VM, causing all sorts of problems. Sometimes I can get it to display a window, but it is inaccessible to the cursor or keyboard.
I've always assumed it had something to do with memory usage, because Parallels does tend to spike CPU and memory. I've never noticed whether this happens during updates, and on the chance that it does, I am switching to being asked whether I want to install updates.
But has anyone else had a similar problem? This has been going on at least since V. 14 and always happens at the absolutely WORST time.