Voice assistant usage causes navigation problems/lockups

[SonOfGib]

Steps to reproduce the bug, if you're planning to report a bug. Please indicate whether the bug is always repoducible.

Use the voice assistant to do stuff (requesting directions seems to trigger it readily.) Then attempt to do any action that requires the control channel (such as starting navigation, or exiting AA etc.) These actions will fail or cause crankshaft to lock up.

Please provide any further information that you might find helpful if available.

This issue was originally reported by @Geekyadz and @TobiasDeBruijn
Duplicates #690

[SonOfGib]

I finally ran into this and was able to track it down, I'll make a fix for it in openauto