It's a heat issue guys.
I've actually tested this and been able to replicate the effect.
1. Left standing in the sun for a moderate amount of time (couple of hours) the right indicator function fails.
2. Left standing in the sun for most of the day (and I admit the strength of the sun and ambient temperature will have an effect) - right indicator doesn't work and if you use the left it 'sticks' on and can't be cancelled because the cancel/change function button also has failed.
3. Leave the bike to cool down for half an hour out of the sun and the functions return in reverse, the cancel/function button comes back first, then the right indicator!
We have regular 100+ days here in Summer so its a big problem.
New dash on order!