Well, recently I've been getting major issues with my connection

I don't know what it is. I recently got a new PS3 'cause my old one broke, and I had to make a new PSN account because I forgot password to my old one (lmao!). But now, whenever I'm in someone's party (or in my own with other people) whenever I'm in the game my connection goes. As in, it acts like it does when it says connection interrupted, moving you around and stuff, not letting you go where you want, firing rapidly lol, but it doesn't say connection interrupted. And sometimes when it does it, it ends up just signing me out. Does anyone know how to fix this? Please say if you want more details. I'm sure it's not my wireless, as there were now problems before. And i've tried unplugging it and waiting then plugging it in after, but it didn't do anything. It only happens when I'm in a party with other people.
Thanks.
