With the VERY large sample size of heroics and normal dungeons that I’ve run using RDF, and the fact that I’ve not seen it a single time tells me that it’s clearly not a wide spread problem. If it were a wide spread problem then I would have seen it at least a hand full of times and not zero.
Again, if you’re getting booted constantly out of dungeons it’s a you problem.
I don’t quest on any of my toons. I level only by dungeon grind and then quest at 85. With 7 max level characters and a few others 81+ That’s hundreds of dungeons ran using the RDF tool.