I have seen similar issues, mainly when I am driving away from my house and the phone switches from wifi to 3G. It doesn't handle that switch very well, although it goes from wifi to 3G just fine without losing connections.
It's also possible that the Cydia server(s) was/were overloaded. I mean, PwnageTool did just come out after all. Jailbreaks for new firmwares do tend to lead to heavier than normal traffic as people try to redownload all their jailbreak apps.
I still cant load new changes in cydia. It gets stuck saying loading new packages and doesn't load anything. Anyone having this issue? It's been 2 days now with the same issue. I don't wana restore