I have a remote (150km from home) Vantage Vue ISS that usually communicates through a 7627 Davis solar wireless repeater to the MBPR as the MBPR loses direct connection with the ISS in heavy rain. However, I also have a Vantage Vue console that receives the ISS signal fine and I have it set to retransmit on a different channel as a backup. The MBPR communicates with the internet through a Huawei 3G dongle.
The system has run perfectly like this without a break since October 2017 (though the MBPR and Vantage Vue were originally installed in a slightly different position without the repeater in May 2017).
Since November I have been suffering breaks in data transmission to the various weather nets I upload to. These breaks are intermittent through each 24 hours with no apparent link to daylight, temperature or rainfall. They occur whether the MBPR is connected via the repeater or via the console (or even direct to the ISS).

I replaced the batteries in both the ISS and the repeater without success so I moved the ISS closer to where the MBPR and Vue consoles are housed and did away with the repeater. The breaks in upload continued.
I then bought a new Vantage Vue ISS and console and set both consoles up to retransmit on different channels so that I could switch between them. The breaks in upload to the weather nets continued with both consoles but when I visited I noticed that both consoles had still been receiving the data from the ISS without an apparent break during the times data was not being uploaded to the weather nets.
During breaks in upload to the weather nets I can still access the MBPR through the web admin page so the fault does not seem to lie with with the 3G system.
Having swapped or removed every other component in the system without resolving the problem, I am now wondering if this intermittent fault might lie with the MBPR which has run continuously for 6.5 years. Has anyone experienced a similar problem to mine? Does anyone think there might be something in the MBPR that could cause this?
Many thanks (and Boris, I apologise for coming back so soon).
Douglas