Problem: SMS Flooding
 

*Hope this is placed in the correct forum*
I'm using a Sprint PPC-6700.
No third party SMS programs.

The incident:
This has happened twice to me so far. The second instance today was me having a conversation via SMS and suddenly I told that I just flooded the recipient with 7 messages repeatedly. My out box only shows the message I sent last and no trance of all the text they reported receiving. Same thing happened to me a few months ago as well with the recipient saying I'm flooding them.

Anyone hear of or encounter this issues before?
Any clues on where to begin to remedy this situation?