Midi keyboard tripping "Save as" box

Whenever I play a C4 on either of two attached midi controller keyboards the Save as… box dialogue opens in Cubase 10.5 Pro.

I can’t find any reason for this but it’s a big problem as you can guess…

I’m also getting some random notes generated which play continuously until the key is pressed again. This is not restricted to one note…

Any thoughts on what’s causing this before I lose my mind?
Thanks in advance.

A post was merged into an existing topic: Cubase Artist 11 - Save as dialog box opens as i play notes on midi keyboard or drumpad