I am experimenting random lags and stability problems since the beginning of april. It usually happens at specific hours, probably peak ones. My character freeze, I cannnot interact with anything (not even log out) and it seems it can't retrieve data from the server (if I open duty finder, it stays always on "obtaining data"). After a few minutes either it recovers just to re-freeze minutes later or it gives me 90000 error.
Now, I tried literally everything: portforwarding, changing router, settings, upgrading firmware, wired connection, changing cables, restarting router, calling ISP (which says everything's fine), contacting SE support (which says it's ISP problem LOL). I am going crazy because I can't understand the cause: SE or ISP?

p.s. I'm from Italy, server phoenix, ps3