This is bizarre! I have done several Five Guys a month for a couple of years. They call me with shops that still need doing, and I do them (some are nicely bonused). I didn't know there was a limit on them, and I hope I don't exceed it since it is a wonderful shop.
I did McD's also for a long time. I even got a "Commendation" for doing 300 McD shops, with the MSC's thanks. Then ... the McD disappeared from my list of shops and I haven't done another for about three years now. I called to ask about them a couple of times but was told I had reached a limit that the client sets for a person to do them (response 1) and they would be sure I got back on the available list to do them (response 2). Still no McD's for me!
Pity. I really liked them for a number of reasons, and I truly like the food. I did another shop (with my wife) for lunch where I had one of the worst experiences ever. Of course, I get lots of offers for that place but I don't take 'em. We have done many restaurants and FF and Five Guys is high on my list of good places.