I often find that sending emails from my Lumia 920 vis WiFi is very slow. But it seems to be much faster right after the phone is powered up. Has anyone else seen this? A message will sit in my Outbox for minutes. Then I power down the phone and power it back up and the message is sent immediately.
This seems like a bug of some sort. (My phone is fully up to date.)
Yes, WiFi is stable, and forcing a restart as you suggest causes the outgoing messages to be sent immediately.