...snip...
the phone back off and Blades started running and hashing away at ~10.9GH/s again. Really, really weird. These things must have really poor shielding or something. But just wanted to say thanks for posting this and wanted to post my experiences, may help others having a similar problem.
I'm using a HTC DHD, and there is no real shielding when you see the bare electronic parts on the PCB. By now, my phone with enabled WLAN is only 50cm (about 2ft) away from the blades and they still run smooth. So i'm a bit uncertain if its the non-existent shielding of the blades or the fact they had to connect via my WLAN router to the proxy. As i said before, all stuff is connected by cables now.