My voice commands were nonexistent with first software for a few days, then started working some of the time and occasionally quite well.
Looks like could be same again, but at the moment the system appears to hear sound but does not have backend support to process.
Not sure where idea of this being MCU related came from. My comment was actually point out that all ages of vehicle seem to be experiencing problems, whatever the cause - as evidence against it relating to MCU.
I've seen several posts about USB devices causing certain failures during updates but so far I haven't seen that prior to installing updates all USB devices must be disconnected. That might be a good idea, but not part of my update routine at the moment.