help, speech recognition interprets silence as input "ten ten ten.

[fuzzydad]

With mic adjusted (integral tablet OR bluetooth headset mic) and following
numerous training sessions, dictation takes off after intial dictated
prhase/input interpreting relative silence (pc fan?) as uninterupted
dictation of "ten ten ten ten..., which I can only assume is a function of
mic settings, but I can't seem to "adjust" this glitch out of the system. It
seems I should be able to get some modicum of functionality via the integral
tablet mic, but I have gone so far as to invest in bluetooth and headset with
no improvement.
Please advise.