Recently I've had three Treo 650s in our organization get stuck in Flow Control mode for e-mail. GoodLink remains installed, yet cannot recieve any new mail. From what I've read, Flow Control should be a temporary situation, but in every case these have been stuck that way for days.

I couldn't find any documentation about how to fix it, so I did a hard-reset and reprovisioned each device.

Is there a way to force a device to come out of Flow Control without a hard-reset, and why are these getting stuck this way. Is there anything on my Exchange server or Good server that could be causing this?