Well 6 weeks after I ordered the Tamar faceplate, I got round to fitting it!

At first the router kept rebooting about every 10 minutes

So I swapped the connections to A/B on the backbox (which I also fitted) and all seems to be running ok
SNR (dB): 8.0 14.0
Attn(dB): 36.0 23.0
Pwr(dBm): 19.8 0.8
Max(Kbps): 9280 1184
Rate (Kbps): 8096 416
Total time = 1 days 2 hours 3 min 3 sec
SF = 5514729
CRC = 323
LOS = 0
LOF = 0
ES = 227
It used to sync at just under 7000 on a good day with crc errors at about 1500
after 24 hours. The longest it's gone before rebooting was about 8 days.
I'll see how long it lasts now
Kidd