I've noticed the last few rides with my horse Cruize that he'll chew on the bit excessively when I ask him to go forward or collect or any kind of aid. I only have an eggbut French link snaffle in his mouth so it's nothing severe and it's the bit I've always used on him. Can this behavior be boredom? Frustration or just ignorance? Should I switch up his bit to a full cheek slow twist for a while until he quits this new habbit of his?? I've never on his face and my cues are always light touches since he doesn't need more. He chews so much at times that he completely ignore my aid and practically pull the reins out of my hands. Should I do more thinking/brain exercises, upward/downward transitions, circles and cirpentines. Even trotting poles?