I’ve noticed an annoying bug with Parallels that cropped up in late 2019, affecting multiple versions of MacOS going back to at least Mojave, and it appears to be an issue a lot of people are having if the long topics on their forums are anything to go on.
The bug is simple, but pernicious. If Parallels is running when you put your Mac to sleep then there’s a good chance your Mac will freeze upon waking up.
I spent a couple of weeks trying to figure out why my computer kept freezing before realizing it only happened when the machine had gone to sleep or I’d closed the lid with Parallels running. Like we’re talking Parallels is running in any capacity, and not just the Virtual Machine is open.
It looks like they’ve known about it for awhile now and on the tech support forums they’re still asking for bug reports and not saying anything about when or if a fix is forthcoming.
If you’re having this issue because you use Parallels on MacOS then there is a simple, if slightly annoying, solution: make sure you close Parallels entirely before you put your Mac to sleep.
Annoying? Yes. I wish they could’ve fixed this by now, but speedy reliable support isn’t something built into the price with Parallels. At least it’s a workable solution if Parallels is part of your workflow.