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I have several vm's I have Win 7 and 10, Mac Mojave and Catalina and two other vm on my Mac Pro with macOs Catalina at this time. I run them separately. Issues generally occur when you don't allocate enough resources to the VMs or your actual OS.

OK, i think i'll manage itHi in Configuration make sure USB 3 is enabled under advanced Settings.
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no, i get a message to install from a CD, which i don't have (it's Parallels 15 Home)...I should have asked but have you installed Parallels Tools into the Mojave VM?
i have only 'install...', not 'reinstall...'... do i need them?You should still be able to install doing it by having vm open along the top menu (next to the apple on your Mac) select Actions>Reinstall Parallels tools>then follow the prompts to complete the installation.View attachment 16020
Installing any software inside of the vm is like installing it in any OS.
kat,Yes you need to install Parallels tools they help your VM to run properly. I get the message to reinstall Parallels Tools because I already have it installed in my VM.