Hi Paddy,
Hmm, this is an interesting one!
At one point this issue was cropping up quite frequently - perhaps every third time I turned the ESC on. As it was getting on my nerves, I took a video of the problem and then raised the issue with SkyRC. I have shared the video via OneDrive here ->
https://1drv.ms/v/s!Ag6zQoOC_SD6goh5UDVcB9nmEO9ddA
When the problem occurs, I can overcome it by pushing the throttle stick forward, then back to neutral. Then "normal service" is resumed. Why, I don't know. This is what I did at the end of the video I've shared. Another way of overcoming it is to turn my transmitter off and back on.
SkyRC said that the "beep, beep, beep, pause, beep, beep, beep ..." I was getting, together with the red flashing LED means a motor overheat (NOT the battery being below voltage as I had originally thought). But the motor was always cold (ESC just turned on and car not used for a while) so this explanation didn't really make sense. SkyRC then said it could be a fault with the motor (most probably the sensor) or the ESC itself. They said I could identify whether it was a problem with the ESC or with the motor by pulling out the motor sensor lead the next time it happens. If the beeping continues, it's a fault with the ESC. If not, it's a fault with the motor. I suppose it could also be a fault with the sensor lead or connections.
Oddly, I've only had it happen once since then, and I was on my way to the start line of a race, so I didn't have time to mess around and follow SkyRC's suggested diagnosis steps.
It happened a lot back in September, but I think only once since. Interestingly, the last time it happened, I was using a different motor and sensor lead from the previous times. That kind of suggests it's an issue with the ESC.
Anyway, it happens so infrequently, and can be overcome by a quick blip of the throttle, so I've just "let it be".
I found the support at SkyRC particularly poor. It was difficult to get through to anyone that knew anything and could communicate in clear English. And also their support chat line doesn't overlap very well with daylight hours in the UK. They go off line at 11am, regardless of whether you are in the middle of a chat or not. They seem to service your chat about once every 20 minutes, so a conversation runs for hours. Very frustrating! Eventually I managed to convince them to email me instead. If you pm me your email address I can forward to you what they said on this.
Personally I think there's probably a bug in the ESC's firmware somewhere, but it requires very specific conditions to be present to show itself.
How often are you seeing this issue and does it behave as I have described above? If you have it happening a lot, it will be much easier to diagnose. I would try their suggestion of pulling the sensor lead. I would also try a firmware upgrade if you can. I'm not sure how to do that as I have the WiFi adaptor for mine, not the SkyRC programme card or ESCLink cable.
Sorry for the long and detailed!
Thanks,
James