mms downloading problem

[bludevlsi]

When i receive a txt. message with a pic attached or just a pic. It has the download button in message. I hit it and it says downloading. Sometimes I will get error message unsuccessful or message will disappear all together. Never use to have this problem. Even when im connected it wont download automatically sometimes. I have to have person send it a 2nd time for me to get pic. Why can i do to fix that and get pic the first time around.