Ae Error: "UU" Key Command activates when Layers are Hidden/Revealed

Hello all!
I have this strange issue. After about 15-20 minutes working in After Effects, this strange error begins to interrupt my workflow. Whenever I hide a layer or unhide a layer, it's as if the "UU" command activates on its own, splaying out all of my changes without my doing.

This isn't a DETRIMENTAL error, but for someone who has a defined workflow, this is incredibly annoying. If I restart after effects, the error goes away, and returns 20 minutes later. Is anyone else having this problem? I know it's petty, but it's annoying enough to warrant some research.

Thanks!