Only a V7.0e project on a fairly slow PC but over the years this dinosaur has served me well and I'm only cutting DV.
First thing I noticed quite some time ago was the izotopes Multiband Compressor can cause A/V sync to drift. Not in the final render, just while previewing. This I can live with, sort of, unless the client is watching.
But now the darndest thing. 1 min segment of A&V, 3 sec title (no audio in the audio track), Several more minutes of talking head A&V.
First minute plays along happily. Get to the title (just Vegas gen media) and the T/L cursor stops, for 3 secs, then jumps to the start of the next clip and plays happily. While the T/L cursor is frozen, the preview window frame readout also freezes.
Bob.