One channel vocals drop out
On certain LP's my Audio Technica LP2D USB turntable will drop out parts of one stereo track. I can play the same album on my old Technics turntable and get the full channel so I suspect that the stylus on the new turntable may not be seating all the way into the LP groove. It does not happen on all LP's. None of the LP2D's manuals give the specific stylus replacement number (annoying) but Amazon seems to have one that looks like it. Would you suspect the stylus or some other problem? I am connected through the USB cable so it isn't any RCA jack issue.
Audio Players & Recorders - Audio Technica - USB Turntable
Answers & Comments
Yes, it is very likely the stylus. the stock needle is conical shaped like a ball point pen. You might have a tonearm that is out of alignment but usually it's the needle. It is possible it is just dust on the tip but if it occurrs in consistent areas of the record, then it is likely that the music is just too demanding for the LP2D you will either have to use your old technics which is likely better quality or you could try upgrading the stylus on your LP2D.
If you do a yahoo search for "4-211-DE-GUARD" with the quotes, the 1st result will take you to an elliptical upgrade over the stock needle. The elliptical tip will pull more info out of the grooves and into your computer for further processing.