Sonoff - ZHA - Zigbee - SWV not connecting

Hi

I have a HA - Green and bought a Sonoff Zigbee 3.0 coordinator use it with ZHA.

I mainly use it for my new Sonoff SWV units in the Garden

The distance between the Garden and the Coordinator was too big and the LQI was reading only about 5-10 but devices were mostly offline

I introduced a Sonoff Mains Powered Plug and installed it on the other side of my Study Wall, this did not help, I then plugged it in closer to the SWV unit and this did not help much either, only when I introduced a 2nd Mains Powered Sonoff Plug (II) did everything come online and LQI reading of connected devices is now around LQI 120

Great, so i bought a 2nd Sonoff SWV and configured it in my study but as soon as i installed it outside in the Garden it lost connectivity and it has not reconnected in over 12 hours

Also when i look at the Zigbee map I cannot see a connection between the Coordinator and the Kitchen repeater I, it only shows a connection to repeater II (or router)

But the Aqara and SWV Back are both connected to repeater I and are online so maybe connectiosn between repeater/routers are not show on the Zigbee map

I have powered down the SWV Front device and pressed the button on the front but it has not reconnected

Should it not find its way to repeater I and then come back online?

All my other devices are not Zigbee based on my HA green setup (except for HUE Bridge devices but I understand they work off a slightly different type of Zigbee, btw Hue is on Channel 25

I have both 2.4ghz and 5ghz network the 2.4ghz is only used for iOT devices and is on channel 1/6/11

I am new to Zigbee, understand other protocols much better and I do not think interference with 2.4Ghz is at play here givenn all the other Zigbee devices are connected okay

Any tips on getting this 2nd SWV unit back online?

I removed the device, added it back in, it reconnected for a brief period of time, i installed a pending firmware update and just as it said 100% installing it went offline again, remained like that for about 2-3 hours and is now back online and responding to commands.

Hopefully it will now remain connected

I installed the Zigbee Map HA integration and the LQI values shown in this map are much lower than the LQI values shown in the build in Zigbee map

Not sure which one to believe but sofar I have had 24 hours of solid connections, long may it last!!