IP Camera And Powerline Network Don't Get Along?

Here is what a wired portion of my network looks like:

internet---dsl modem---airport extreme---powerline ethernet adapter****powerline ethernet adapter---5 port switch---(ip camera & ioBridge 204)

The airport extreme is also hardwired to a PC that I use to view the IP camera.The issue I'm having is with the connection to the IP Camera.The connection to the camera worked for a long time, then starting dropping periodically and now it doesn't work at all.The ioBridge connected to the same switch as the camera connects to my network and the internet just fine.

Here's what I've done to troubleshoot: I plugged the camera in to my airport extreme and it worked fine. When I plug my camera into the other end of the powerline ethernet adapters, though, it doesn't work (even though the ioBridge does). I replaced the powerline adapters today (because they had worked before, so I guessed something had fried in them) but the connection still doesn't work.

When I ping the camera (when it's on the other side of powerline adapters and "not working") the response time is around 3ms (good) but there is about a 33% loss rate (bad).I'm guessing it's the loss rate that is keeping it from displaying the video stream on the computer...but I can't think of what changed between when it was working and when it stopped working that would cause it lose packets like that.