Started it again, and then about half the way up I dropped my chain and from that point onwards my gears keep shifting so whenever I got into a decent rhythm, it would jump and I'd be in a gear too high/low randomly.
Zwift is getting realistic if it's now simulating dropped chains!
Reminds me of this
. He could probably find a cheaper and more efficient way of doing his workouts but like you say, each to their own.

