I was riding in our indoor arena just working on our transitions and yielding to leg pressure. He was doing very well and was stopping and walking just from my seat. But then he decided he was done for the night. He never bucked, reared or anything bad, he just stopped. And REFUSED to move. I squeezed, kicked, even slapped him on the bum with my hand and he WOULD NOT MOVE. I ended up having to get off him, lunge him for a few circles and get back on and continue. He seemed to do this after trotting the most.He would gradually go into smaller and smaller circles at the trot until he walked and eventually stopped. No amount of kicking, squeezing or anything else would keep him going. When I would try using my inside leg to push him out on the circle he would go into a very slow reining spin. The trainer who put 30 days on him is a reining trainer but I can't imagine she would be teaching him these movements already, especially because she knows I want him as a working cow horse, not a reining horse.
I know he is being stubborn because he is very lazy and wants to decide when he is done work. I ended the lesson when I had him trotting around the outside of the arena nicely and then we went on a little walk around the property because he loves trail riding.
We rarely use the indoor arena so I don't think its arena sour and I try to keep things interesting by changing up our routine. We do ground work daily and he is very respectful in every other aspect of handling.
Any suggestions would be appreciated!