Random Freezing while playing in Expansion Stages

[GanonZack]

As the title says, I get random freezing sometimes when I'm playing on the Expansion Stages (both when I'm about to start a match or when I'm in the middle of a fight).
I was using a stage expansion code for 37 stages before and it was working perfectly, but recently I had changed to the classic expansion stage (5.3) by libertyernie.
I'm not using project m or brawl minus, I put it on normal Brawl (with all the necessary codes and files, including the codes for the Independant Song Loader by Oshtoby, but without xml provided in the pack because I have the previous one that is very similar).
I have tried two versions of the expansion and it still freezes randomly. Any help on how to solve this problem will be appreciated, thanks.