Hey, I noticed nobody had any ideas on this so maybe I can take a guess.
Does it stop responding to ALL keyboard shortcuts, including windows shortcuts? For example can you still do ctrl+S to save, or alt+F4 to close?
Are there any shortcuts that DO work, like is it only ctrl+[whatever] or alt+[whatever] that fails, while shortcuts like pressing V to get the arrow tool still work?
Do you want to upload a file somewhere and I can see if the problem happens on my end too? If you need a straightforward place to upload, sendspace.com should work, or dropbox.
I know that ID shortcuts can get screwed up in a weird way, where they won’t be fixable with the usual custom keyboard shortcut interface. For example I somehow broke my ability to press “Enter” to confirm a dialogue box. Nothing I did within InDesign itself could fix it. I had to edit the indesign shortcuts file directly, which is found (on windows machines) here: C:\Users\Yourname\AppData\Roaming\Adobe\InDesign\Version #n_US\InDesign Shortcut Sets\custom_shortcuts.indk
Exact details of how that was edited can be found in my post. It’s basically a text file. https://indesignsecrets.com/topic/anyone-else-getting-an-id6-bug-where-pressing-enter-doesnt-ok-dialogue-boxes-anymore#post-94415