MW2 online is making me CRAZY!

So I’ve been trying to get back into the game, but I’m running into issues on both consoles... I still have my PS3, but my stats keep getting reset every time, which makes it basically unplayable. So I decided to switch things up — bought an Xbox One S from Marketplace, got Xbox Live, and I can still log into my account just fine. But now I’ve got a new problem: my game freezes before I can even start playing online. It only happens when I try to go online — offline works fine. I’ve already tried searching online and even joined some Discords, but nothing has helped so far 💀 Anyone know what could be causing this or how to fix it?