NAV system resets EVERY time I start the car...I'm stumped

Hey y'all,

So I recently changed my transmission fluid on my 2006 TL 6MT, and for those of you who have done it you'll know that you have to completely remove the battery...

After I did this I turned on the car and had to reset the NAV system and radio using the codes provided by the dealership. No big deal I thought, that is what happens when you remove the battery. However the next morning when I started the car, the nav system rebooted, I had to reenter the codes, etc. But it keeps happening, every time I turn the car on.:tantrum: I think it is an electrical issue, that somehow started with that initial removal of the battery.

Just yesterday the small screen above the Nav screen (where you can see the air conditioning settings and radio frequencies) stopped showing the radio frequencies. I can still use the radio presets and the audio still works.

I took the car to the dealership and for some reason they are under the impression that it is fine...wtf?

Has anyone dealt with this issue? It is driving me crazy!

Thanks