Another person who reported this issue is miraculon, and I'm pretty sure he has multiple transmitters. Again, he'll have confirm.
I have a total of six transmitters and one long-range repeater.
Transmitters consist of 2 anemometer transmitters, a VP2 ISS, a Temp/Hum station, another "rain station"/temp station, and a temp station. (I have a mish-mash of stations configured as "ISS" for the Envoy8x and MBPro that do double duty)
The only LOS that has occurred is a very old "eBay special" VP2 console and the Marina VUE/Repeater setup. The "Marina VUE" only looks at the Marina data on Station #1/Repeater A. I suspect that the Marina's ISS actually experienced the "low temp issue" (whatever it is) because the signal from the Marina's Weatherlink page was also lost coincidentally with my repeater signal. I suspect that the long range repeater takes a long time to synch back up and do its FHSS dance.
The last time I checked the ISS and Temp/Hum batteries (November?) the voltages were just around 3V. I have all "OK" on the Weatherlink (PC SW) battery status page.
The signals from my own sensors have not been lost on two VP2 consoles, two VUE consoles, two Envoys and an Envoy8x. Only the old "eBay" console lost signal and went to dashes.
Greg H.