Hi Dinesh,
Have you examined the hall pins when the disturbance occurs? This should help you determine if the disturbance is due to incorrect hall information or an incorrect commutation sequence. If the hall information is correct, the code should be further examined.
Changing the LED to toggle and monitoring the LED can provide information if the code is running as expected. This can help determine if there is some interaction between the main code and the interrupts.
Have you examined the hall pins when the disturbance occurs? This should help you determine if the disturbance is due to incorrect hall information or an incorrect commutation sequence. If the hall information is correct, the code should be further examined.
Changing the LED to toggle and monitoring the LED can provide information if the code is running as expected. This can help determine if there is some interaction between the main code and the interrupts.