My 4yo Arab gelding has found a new game. At a collected trot, he'll grab the bit and it leaves me with no control. He only does it for a couple of beats and he doesn't do anything malicious. It's more like he just doesn't want to listen for a few seconds. Then, he'll drop the bit and move on with things. While he only does it for a couple of beats at a time, he does it far more often moving counter-clockwise than he does moving clockwise. He doesn't do it when we're warming up with a loose rein and he doesn't do it at the walk at all. I don't canter him yet, so I don't know if he would do it then.
I don't want this "game" to turn into anything dangerous. For example, I've known horses that will grab the bit and run. Does anyone have any tips on what I can do to stop him from grabbing the bit?