A majority of all 90k I have experienced have NOT been from SE servers disconnecting me, but from issues with my network provider.
Whenever it happens, the gateway at my network provider stops responding to ping, and there's no way that SE can cause that.
My network provider keep saying there is no problem, even when I can prove there is A problem on their side.

The times I've been certain that it was on SE's side the disconnection occurred, it also affected everyone connected to the same instance/world server.

The lag issues are in general separate from the 90k issues and mostly happen during peak times when servers are congested.