Upon further review it looks like my Pixel 2 doesn’t know how to display the signal strength when the phone connects to the AT&T Microcell in our home. When I leave the house it displays fine, but when I come back and it connects to the Microcell I actually see it show all bars and then the bars disappear. Perhaps it’s due to the fact that the microcell only provides 3G data, which I don’t care about because I use WiFi for data at home. In the the number of bars don’t really matter so long as my call connections work and don’t drop, but it’s annoying.