All good @Andy80.
The problem is, there’s no technical support with this current service. Other than ‘is the dsl light on’.
I’ve just put the modem/router into bridge mode so it’s effectively a modem. Then I have a pfsense box behind that with 2 gateways in a failover group.
The 5G backup unit (installed over the weekend) was showing promise. There was slight drop today but only for about 10-15 seconds. The next 24 hours will be telling.
My 5g connection for home has some little glitches, especially switching between 5g and LTE. One tip I got with the modem I’m using is to schedule a reboot once or twice a week so that the service gets all the numbers updated.
I need to put up an external antenna, the aluminum siding on our house creates a difficult RF situation.
@Greg_E there have been minor glitches all the way through. Some clients dropping off for 30-120 seconds but alas, here are a few samples from last night.
It doesn’t matter, because it happened during the night but if the same happens during the day…there are going to be problems.

The mystery continues. Most of my cards are leaning in the electrical fluctuations direction.