OK, I think I've fixed this, without a wifi dongle.
There is a setting in the Killer app called Killer Prioritization Engine. Since I've set that to Off, I've had no issues.
Fingers crossed that this lasts.
Well, it definitely seems to have worked for me - connection has been rock solid since I turned that "feature" off.
I don't know if that helps if you have an ethernet connection - I'm using WiFi.
I hope that helps others.
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