That is strange, like you said, seperate exchanges 😕
Makes me wonder what sort of monitoring or lack of they have for network traffic in the exchange, surely they would see a large drop in traffic on certain bits of kit.
When my internet went down last time, a device I have on my network was still working, I know it doesn't use masses of bandwidth, but it's quite time critical, in the sense of if it doesnt receive a reply, it stops doing what it does. Could it be down to some throttling they are doing (wrongly).
Next time it happens I will have to try and shunt a load of data around using non standard ports and via vpn to see if that does anything.
And this morning the same problems are back.... anyone else having problems?
Sadly, this also means the problems will also likely be gone when the BT engineer comes tomorrow morning.