Cultus 2010 auto converting back to petrol from cng
I've Suzuki Cultus 2010 efi. The issue I am facing is when it get converted to cng after 92 sec, it automatically converts back to petrol , some times cng switch's lights turn off itself. I have discussed the issue with a few cng kit workers, they says "its due to switch as it is malfunctioning, change it".
Experts are requested to suggest the solution asap and please tell me, Is it recommended to change the stock switch with custom switch m96 along with wiring which enables car to get convert automatically after 5 sec to cng and stock lambda sensor will be no longer incharge?