I have the exact same problem. Played at around launch with no issues. Now I can’t even log into the game with out constant disconnections.
I have no anti virus software (Removed it all), I have scanned for malware which came up negative. My ISP nor router is the issue my room mate plays on the same connection and does not have this issue. Say it is my PC all you want Asus G73JH, but I can run every other game on my pc just fine (BF3, Batman AC, TF, LoL, and steam loads up quickly). I have changed my firewall settings and have my router set up correctly with the correct port forwarding.