Yes, they tried to give me that same reason - that I had stepped out of coverage range.
But that doesn't explain why it shouldn't re-connect once I get back into network range - something for which the Rogers tech had no explanation. It also doesn't explain the 2 times it's happened since where it was working fine, sitting at my desk, and then stopped working and didnt' reconnect, all while *still* sitting at my desk. then I restarted the device, and it connected fine. Never stood up once, but somehow I managed to step out of the network range. The tech tried to say that somehow, service must have dropped while I sat there. But he still had no explanation for why it shouldn't have just quietly and automatically reconnected itself to EDGE.
8700r / BIS