Game freezes and takes time to load models

Vanilla game runs normally on my pc and everything is fine, when joining Galactic Assault specially on the Naboo map everything goes normal at first but at the final phases the game has sudden freezes and normal units become invisible for like a minute but i can move, heroes and reinforcementes become invisible but cant move, this also happens in the Kashyyyk map and sometimes on Kamino, i dont think this has something to do with my graphic settings as i put them on low and its still happening, idk, help