I am facing this problem with Royal Enfield Himalayan 2021 bs6 model for the 3rd time now. RF providing new solution this time with 4pin Relay.
First occurrence of this problem (1500 km)    • Himalayan Starting Problem | Chapter 1  
Second occurrence of this problem (2800 km)    • Himalayan Starting Problem | Chapter 2  
This is the third time (12800 km) I have faced the same issue and got it fixed.
I will keep monitoring this issue the only problem I am facing with Royal Enfield Himalayan 2021 bs6 model.