Drop down menus stop opening

Hi
I’m working in 4.27.0 on a windows 10 pro. ADM 9 5950X RTX 3090
Occasionally as I’m working on a project the drop-down menus will stop working. Any menu anywhere like snap setting s in the viewport or any drop down in the details panel. Basically, any where there is a LMB click and drag select menu. They will be working fine for a while, sometimes hours, and then suddenly they stop. When I click the menu flashes on the screen for an instant before disappearing. A restart of Ureal will fix the issue but its really annoying to stop and restart all the time. I have experienced this in 4.26 as well but I haven’t spent enough time in 5 to notice if it happens there.

Is there something I’m inadvertently doing or some way to reset this without having to restart.

And sorry about the VR tag, its the only one it would let me select. And BTW I’m not having this issue outside of Unreal, (or this forum apparently)