The player has a huge button buffer, so there's no way we're overrunning it. I wonder why it's refusing the buttons?
I've occasionally seen similar behavior with Hijack ghosting long presses to the player.

For example...

Sometimes (rarely) when it's supposed to be doing the long-press to toggle visuals mode (when I have Restore DC/Car Visuals activated), it will do this:

- It seems to not restore the visuals, as if the long press on the bottom button hadn't happened at all. The screen doesn't change to indicate any keys were ghosted at all.

- The next key I press on the player, even if it's just a knob-turn, the main menu will open, (i.e., it got a short press on bottom button or perhaps just the Key Released event for the bottom button), then that will be followed by whatever key or knob-turn I'd done.

This is very rare and intermittent, I can't get it to happen every time. But it sounds a lot like what GeoffTT was describing.
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Tony Fabris