i have been having problems with freezes of Adobe Photoshop 21 over several updates.
I am using a graphics tablet to draw in Photoshop and on certain occasions, i have not found the trigger so far, the canvas freezes. That means i can still save and use the toolbar at the top, but the canvas is stuck and i cannot interact with it. My cursor is a normal mouse cursor, no matter what tool I select. I cannot move the canvas and i cannot hide the canvas or interact with it in any way.
Restarting Photoshop fixes it immediately.
I am using Photoshop 21, newest version with a graphics tablet. The bug occurs for multiple tablets. I use Windows 10 with a somewhat beefy pc that easily handles Photoshop with all its quirks.
I'm having the same issue on different systems with different specs. The only thing the two systems have in common is that they're both running Windows 10 and use a Nvidia GPU. All drivers are up to date.
One thing that I have noticed right now is that it has happened twiche in a row on different documents while I was working in Quick Mask mode.
I'm having a similar problem, only PS becomes totally unresponsive. Running an I9 processor on a MSI motherboard with 32g of memory and using an Nividia 1070 GPU. Seems to be totally random. Sometimes I can work for an hour or more, other times within minutes of opening an image.