I'm having this same problem with my AT&T Sam. Galaxy SII.
I just downloaded Foxfi and I can connect my new Transformer TF300, but after less than a minute, Foxfi disconnects.
When I look in the log on Juice Defender Ultimate on my SGSII, it says: "WARNING throttling data toggle".
I've had Foxfi on my phone less than 24 hours.
Does AT&T already know about this app on my phone?
Any idea what I can do to resolve this?
Any help is appreciated.
tl3