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Having difficulty texting

This is my second Thunderbolt (it was replaced do to the microphone not working) and I had the same problem with the first one.  No matter how many bars I have on the strength I keep having to resend the text over and over.  Sometimes it will go thru and other times it will not.   The last few times I tried to send one I wrote down the following message:  Cause Code: 3  Error Class: 2.

Is there anything I can do to fix this problem?  I am in south Florida and have great service here.