Pokecoin threshold

Hey @ all, i noticed that if you collect 1000 Coins through Gyms without spending them or buying some with Cash, your box rotation stops and you get the normal 3 boxes without changing. Happened to me and a friend various times now. We had to either buy something in the Shop or pokecoins with Cash to get out of it. Have you experienced similar situations?

Edit: i noticed some People here "braging with coins" its not about the amount its about 20/21 consecutively days hoarding coins from gyms without spending them, buying coins for cash or buying tickets.