No I dont think so, I have flashed a new built firmware, with no settings saved, to W8980. First I was using HH5A and same thing was occurring with my phone.
Well in any case, I tried stopping firewall and flushing iptables entries but it's still the same on my phone. Although traceping showed rather better results but the official twitter app is still crappy for me. 3rd paty twitter apps and other devices on my network still working fine. Now I am forced to believe that something actually may be wrong with my phone. Because I have 2 more android devices and they work fine.