Control panel button lockout

On a fairly frequent basis, I am getting a control panel lockout.
I can control the FB from the web interface, but the buttons are no longer working.

It appears to be if I press 5 (e-stop) followed by 4 (unlock) then 3 to launch a script. If I do it too quickly, it appear to cause the lockout - or it could be a coincidence. Never the less, the lockout is annoying. Has anyone else seen this?

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