Thanks guys for the input and questions. The 5-in-1 is a couple of years old. I bought a package deal on ebay. Before I mounted it, I disassembled it and cleaned out the spider webs and cleaned the fan and lubricated the motor bushings as well. The sensor is actually about 100 feet from the display and I have discovered that the problem may be that my display sits too close to my laptop which is on most of the time. Last night when I shut down the laptop, the signal strength meter came back showing three bars. And when I started the laptop this morning, the bars went away. The times that I get a disconnect message, it is on the ticker display. The wifi connection is strong and there is no problem with the hub or internet connection. Just the display connection. I just noticed that the signal strength meter was apparently searching for a signal again and I just got the disconnect message again. I guess its time to relocate the display.
It's not using WiFi. The sensor signal is on 433.92 MHz and has nothing to do with WiFi protocols.
Just the general spectrum RFI and harmonics, factoring in relative RF power levels, is more than enough to bugger up an incoming 433 (or 900) MHz WX system 'receive' signal. The absolute frequencies involved barely matter in many cases (less so when very widely separated).
I have an OTA TV antenna located 6-15 feet away from a whole bunch of various WiFi, DECT, cellular and whatever devices. At certain times and conditions those RFI sources clearly wipe out reception of certain television channels.
Some of those TV channels are in similar bands as the 433MHz WX ones and they get whacked by 1.6-2.5GHz device signals in various bands. I can sometimes watch it happen by starting something like a major download on a computer and see the TV image get badly pixelated or the TV just puts up a "channel no signal" message. It does seem to be limited to the weaker, more distant TV channels most of the time.
(NoAm digital television no longer uses UHF TV channels above channel 51):
Terrestrial television channels are divided into two bands: the VHF band which comprises channels 2 through 13 and occupies frequencies between 54 through 216 MHz, and the UHF band, which comprises channels 14 through 83 and occupies frequencies between 470 and 890 MHz.
https://en.wikipedia.org/wiki/Pan-American_television_frequencies