Originally Posted by Saddlebag
The next time you ride and he goes down, get off and pull his head down so he's laying flat. Sit behind his head and hold the reins so he can't get up. .
Good plan. I had a horse that did this several times. I sat on his neck, while pulling his nose up. He was stuck. Ruined his day sorta like he had ruined mine. He never tried it again.
Sending him to a trainer may be the safest plan. You could really get hurt playing around with him.