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It's now hit or miss. Yesterday it took several tries to accept a voice navigation request. It also appears the voice command process has changed - before you had to hit the button again to signify you were done talking; now if you do it cancels! So just finish talking and don't hit the button again to let it know you are done.
I have only had my MS for a few weeks, but I did notice voice commands have gotten worse in just the last week or so. It could be coincidence, but I’ve found that talking very loud improves the success rate.