Keyboard and mouse problems

Hello Folks,

I've been running Xubuntu 18.04 for a very long time with no problems, but recently the mouse and keyboard keep freezing and I have to push the reboot button on the case to get them back.

Any ideas please? Is anyone else experiencing this? Could it be a recent update?

Thanks for any suggestions. Seems weird to be here knowing that Mark won't be among the first responders...