Pushed the reset button on the back of the Access, no success. The Atlas is still the only sensor out of seven that has signal problems.
Winner, Winner, Chicken Dinner:
As suggested by Mabcmb, I removed the batteries and unplugged the power. Its back to normal. Its only been 10 minutes but signal strength has been a steady 4 for the Atlas. Not sure why removing the batteries made the difference, would've thought by pushing the reset button it would clear everythng. But removing the batteries worked.
Back to normal! Thanks for the suggestion!