Originally Posted by Ian
Or a rogue device on the network that comes and goes with same IP address. If you keep switching your devices off and on and you are not using fixed ip addresses set on each the device then I would hate to think what mess your ip addresses might be getting in.
No Ian, I do not "keep switching your devices off and on". T3 has been off line for some time until now but T1 & T2 have been on 24/7. But T3 has been on and online for the last few weeks except when it decided to go offline so had to be rebooted to wake it up.

You make a valid point but it is not the answer to what is happening but thanks to Russ a solution is in sight.

John