I am having similiar trouble. I have 3 access points in my home which are verizon (actiontec), cisco e3000 (linksys), and an older netgear. My phone can connect to all of them, but has intermittent trouble sending data on the cisco AP. However, I have multiple laptop can connect and send data on all of them with no issue at all.
I had this identical problem: Mulitiple access points in my home. Once I disconnected them, and used only the main access point (connected to my cable modem) all of my wifi issues went away. Hope this helps.
Here's what I did... I was messing around with various things and I came up with this: I made the Droid "forget" the wireless network I set up. Then I re-entered the network SSID and password... and magically it worked.
After seeing many postings on this, I'm beginning to think that having your phone "forget" the setup or making any change to your router fixes wifi problems. Goofy.
Sent from my DROID2