A quick update: I just realized that my Fire TV Stick was connecting to 5G wireless network, which worked perfect in the old, but not so much in the new location. I thought I changed it to 2.4 GHz in the settings, but it looks like I was wrong. Today I checked the settings, and it was connected to 5 Ghz. Since my 5 GHz signal sometimes goes over 60 dBm (close to 70) in this room, that may have been my only problem. I changed it to 2.4 GHz (typically between 45-50 dBm) and it seems to be running steady now, without any glitches. I still think that these wifi antennas are not the best they could be, but this may just work.