Yes, I have this same symptom, and my ENT said it was probably related to two things. One is Eagle syndrome. He said nothing could be done. The other is Sjogren's syndrome (due to dryness of the ear canal). He said he didn't have any good treatments for this that I haven't already tried (I've had a variety of responses to treatment that required discontinuation). He also mentioned my history of Eustachian tube dysfunction, but he felt this wasn't the case at this time. So basically, I went in with a symptom, and left with the same symptom, and no treatment options. Seems we could at least treat the symptom if we can't treat the cause!
Hang in there!