When I was on the ring, after about a year of using it, I started to experience that too, even if I took the ring out right before and used lots of lube. My doc didn't believe me that it was the ring, but as soon as I stopped it, I felt better.
Try taking it out like the ladies said, but if that doesn't work, just switch. I got to the point where I hated sex because it hurt so bad every time, and I couldn't find anything wrong except once I stopped using the ring I was instantly better.