So I can start up the game just fine but within 10-30 mins regardless of where I'm at or what I'm doing the game just starts stuttering/lagging until I can no longer move and am stuck there unable to do anything besides just quit out the game and restart

there's no way to fix all the issues that the Xbox system has with PSO2 because the game wasn't made for this console and fixing it with the current engine is simply not worth it, there are just some ways to those issues don't happen that fast or in a more bearable way like cleaning the console cache and reducing the graphics