Greyrock Cave Spawn Glitch

Every time I go to try to capture either an S Ranked Fang or an S Rank Snowfawn in greyrock cave, I cannot find one.

Sometimes, there is an occasional but rare glitch in that very same cave where when I finish the first monster battle, and exit the experience page, the game crashes.

Could the two isolated event actually be related? (For example, when S Rank Snowfawn and/or S Rank Fang are present in the cave, the game will crash after the very first monster battle in grey rock cave.)

Please check into this for me. Thank you!