Ok, what is going on! I had push email from yahoo and it was working just fine for the first 2 days and then this morning I go work and out the blue my email program would freeze right after I would finish typing up the email and then hitting send( it would never make the airplane sound or finish the bar) and then crash me back the the home page of the Iphone and when I would go back into the mail the app and it would place me right back where it left me (but would send the mail) with the last area the cursor was, almost like it never was sent or finished, but with wifi it actually goes thru and completes the email. What is going on?

***Just a little not the .Mac account pulls the email and sends it just fine under EDGE(but it's not push email). ***
Mac OS X (10.4.10)