Alltel Touch Pro on Verizon keeps reverting to Alltel MIP

[AceXMachine]

I'm have a problem with my Alltel touch pro activated and programmed on Verizon. Every so often, I don't know if it is after a soft reset or not, the MIP/Security settings keep reverting to MDN@alltel.net. I have to change them back and have my DMU keys reset before I can reconnect to the internet/data. Any ideas on how/why this is happening and how to stop it from occuring?

Thanks in advance for any advice.