I think I have some WiFi issue with my S2, it seems to go to sleep, even though I have my sleep policy set to never also. I'll turn on WiFi and it'll connect to my WiFi network, browsing and sync work fine. If I leave my phone for a little while and try to sync or browse it doesn't work, even though the WiFi icon is still at the top, and if I look at details it shows I am connected and what my IP address is. If I attempt to ping my phone's IP address from another device I get no response. If I turn off WiFi, and then turn it back on again, browsing, syncing and pings work.......???