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When I have heard of this happening, it was when disk space was getting considerably lwo and the scratch disk could no longer function correctly.

Please provide more info e.g.

OS - version

Photoshop version specifically (I assume the most recent download available yet would be good to verify)

Hardware specs eg total main memory and especially you Hard drive size and the free space available.

Its possible that your computer does not have enough resources or they are overloaded with too many processes running in prarllel.

That's my best guess of what is going on until you provide more details.

John Wheeler