@JimJano Thanks for all the info in this chat. Established that there was probably a hardware fault with one of my nodes. thanks to Amazon and TP-Link for getting a complete new kit shipped out....

@TP-Link Thanks for the suggestion. The stability had got worse over the last few days, and I'm now waiting for a replacement unit to be shipped by amazon, under warranty. The red LED reboots had...

Did a bit more playing with the settings in DecoApp. Disabling the IPv6 stack seems to have restored stability. Maybe CPU overload somewhere along the line?

@JimJano Been working fine since I bought the P9 kit. Suddenly last week one node has started randomly dropping and going through a flash red, reboot cycle. Happening multiple times a day. Nothing...