Hello everyone, Rob Pope here - the British Forrest Gump (just happened to be the Australian marathon champion once) 😀
I heard I'd been mentioned so I thought I'd pop in.
My cadence drop outs were due to me using a stroller and pushing it predominantly with my watch hand, so unlike the pole issue, my wrist doesn't swing and therefore doesn't register on the accelerometer. If you was want to go hunting for when I was supported (about 45% of the time, so August 2017 would be a good time, for example), you'll see no cadence drop outs.
I concur with those that say he needs to share his Connect data.