Hi Jose,
A good idea by Wald to check for GEN TX mods. There is a Gen folder in the Files section with some RF board pictures and info.
I was looking for items to add to the Files section and found an item about FT-980 batteries. Take a look at "FT-980 Batteries".
I would try starting the FT-980 with no batteries to see if the default program clears the problem. Then put fresh batteries in.
73
Roger VE7LB