Thank you. There is no power management in the adaptor properties. I have turned off the option to selectively suspend USB devices and will see if this improves things.

Update: it happened this morning. I could still see the UB500 in device manager. It said it was working properly (but it wasn't!). When I looked at the power state in device manager, it said D2. I...

Thanks and sorry for the late reply - I have been waiting for the glitch to re-appear so I can gather more info - but it is currently behaving itself! I will reply when the fault recurs. Certainly...

I am using a UB500 with Windows 10 and a Logitech K380 keyboard. Everything works fine until the PC goes to sleep. I can wake the PC from this sleep by moving the mouse or clicking one of its buttons...