Level Freezing H2A Coop

A friend and I have been running through Halo 2 on Legendary and have encountered some problems with the levels. Everything was fine until Delta Halo. The game would freeze toward the end where the skull is and kick us out. We passed it by running past everything. Than we did Regret and same thing except this was when you’re jumping on the prophet and punching. Is it a checkpoint reload error?

The same thing keeps happening me to me. Then when I exchanged the game, it was the next level that keeps freezing on me…

this happens to my friend and I also but on the level “Regret”