Fps drops and game freezes

hey everyone, ive had this issue since yesterday. i went to go spectate a game my friend was in and the game started to freeze and lag and now everytime I go to join a game, it freezes and has fps drops. i have an intel core i5 and a gtx 1660 super. i have no idea why this started happening as it has never happened before. if you have any solutions I would appreciate it, thanks!