Yes. All the time. Its so annoying. Factory reset will solve it temporarily. Im not resetting my phone though. Me and my friend experience this issue. Im using a ATT nokia lumia 920 and he is using a Lumia 810 from tmobile. Both get extremely frustrated with this issue. Sometime ill type up a message, then back out to home before it "sends" and then go back to see its not even there. If it was instant like it should be and was when I purchased the phone, that wouldn't be a problem. Sometimes it takes upwards to more than a minute to send and/or open a conversation with someone. If im busy this is not acceptable.I have started experiencing this messaging lag, too, in recent months. When I try to send a message, the send icon will be grayed out, but the message will take about ten seconds to send. Also, I've experienced when I try to open up the messaging hub no threads will show, or when I click on a thread, I'll see the loading dots for about fifteen seconds.
Has anyone else experienced these things and/or found a solution?