Wrong local channels / wrong "Location Zip Code"

Ever since I updated my CC info with DirecTV Stream a few days ago, I have been getting local channels from Denver, CO as opposed to Dallas, TX (my location).

I discovered that my "Location Zip Code" was incorrect.  Trying to get it fixed by talking to DirecTV Stream support representatives (3 to be exact) did not work.  I discovered that the only way to fix it is by "restarting" the box.  After restarting, the "Location Zip Code" is corrected, but it takes a few minutes for the channel guide to correct itself and the correct local channels start to work.  But the fix is only temporary.  Every morning (and sometimes during the day), I discover that I am not getting correct local channels and confirm that the "Location Zip Code" has reverted back to being incorrect.  Billing zip code is correct.  I have 3 boxes and it is happening on all three boxes.

Any suggestions on how to fix this permanently?