I've notice it, as well. I'm thinking of returning the phone. Battery life stinks, bloatware, poor voice recognition... Originally had the Samsung Charge until I realized there was no led light for notifications. Maybe I'll make the triad and return the Revolution for the Thunderbolt.
I've read there's a file that needs to be downloaded when you set the voice to text engine to Google. However, I'm not given an option to switch to Google in my settings. If anyone has a fix for the voice to text on LG, I'd also appreciate the help.