How Do You Fix a Connection Issue on Ps3?

My ps3 has been acting up for about a month. Whenever I go onto an online game it either lags really badly making it unplayable or it just disconnects me. Im pretty sure it's not the router, because i have tried reseting it but it didn't make the connection better and the actual Internet works fine. The ps3 itself is probably the problem. Please help. Thanks

the internet does not go bad. you probably need to open your ports for the ip address for your ps3. or choosing to make it dns. the guy above is retarted