If you shoot that WB with any regularity at all you will have that problem. The guy at your shop sure aint the only one that's heard that exact same story. I've switched out a bunch myself for guy's that shoot on a regular basis. Those bristles get worn down and blown out. Absolutely the stupidest design I have ever seen for a bow rest. How so many people get suckered in to those things I have yet to figure out.
Which model of QAD do you plan to switch to?