Under Win 7 (64 bit) after accepting dictation in Word 20-10 for awhile (half hour, for example), Dragon 11.5 ceases to recocnize dictation and recognizes only commands. Only a system restart corrects this. Microphone tests well and works well on another system,. Have used Dragon for years and never encountered anything like this. It seems (possibly) to be touched off by clicking on the microphone to turn it off temorarily. But that may or may not be coincidental. No other programs than Dragon and Word running at the time. Anyone else encounter this?