Transmission Program in f-150

Bought a 2010 back in Dec and immediately had an issue with the transmission. Brought it back and they assured me it was just the program and reset it.

3 months later it's doing it again, service rep told me to just disconnect the negative post to factory reset the program.

Do I need to push for them to spend some money and replace something in the computer? Is this a precursor to some major issues down the road?

I have an extended warranty for 3 more years but once that's gone...