Oh something I learned after I bought a cheaper sound card.. you must have a decent sound card along with a decent microphone.

I have a Plantronics head set mic that is 8 yrs old but it was only 20 bucks at the time. It worked well until I installed a replacement sound card that was not as good as my sound blaster card.
as soon as I installed a upgraded card everything worked fine again.

So if you keep having recognition issues you might want to do searches for "best microphone" or "best sound card" and maybe you can narrow it own to find which is the problem.

The sound card & mic are as important as the software in this case.