Same here. Been happening for awhile now on 10.15.0 and 10.15.1. Restart solves it for awhile and back to same problem. All kinds of other problem shows up too like thunderbolt mounted target disk mode drives don't show up. And yes, reboot solves it.
Also had to help someone that did update from 10.15.0 to 10.15.1 and completely wedged themselves (won't boot properly, recovery can't complete) This is why I put it in Target Disk Mode, copied all the user files. Reformatted the drive and reinstall 10.15.1, re setup account, and put back their files.
Catalina has got to be a major problem for Apple given the prevalence of problems. Pretty clear both HW and SW quality are deteriorating.