Photoshop 20.0.7 - tools locking up while editing using Wacom on macOS 10.13.6

Running the latest version of photoshop on mac. specs below.

in the middle of doing editing on the image, toolbar will periodically lock up and default to the hand tool.  no other tools will activate. I've tried resetting preferences which sometimes works and sometimes not. I'll reboot system and most of the time that will fix it, but not always.  I have to say its a pain is the ars when this happens. Using an older wacom. Other than resetting pref. does anyone have a permanent fix for this?

thanks

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