I thought I'd provide an update since I started this thread.
Since I initially raised the issue, it seems to have happened very few times. It's a real freak occurrence, but very annoying when it does happen. The Sky RC helpdesk had said the bleep code indicates a problem with the motor sensor reading. Therefore either a problem with the motor, the sensor lead or the ESC. But I think the fact that there's a few of us out there experiencing this probably points more to a problem with the ESC. I would guess a firmware bug which is exposed by a combination of factors (if only we knew what).
I have to say I haven't tried updating the firmware as I only have the WiFi module (not the program card or SkyLink cable) and don't think you can use it to update the firmware. I think I am on 2.02, so definitely quite an old version. I'd be interested to know whether this works for anyone else.
Incidentally, I have a friend with the Corally 160A who has seen the same intermittent issue. But I actually have the same model of ESC in one of my other cars and it's faultless.
I'm sorry to say that none of this really helps. But I do think if we keep getting the problem we should all apply some pressure to Sky RC to look into it in more depth.
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