Hello sir, I'm using honda unicorn bs6 bike. 2000km covered in 3 month

Hello sir,
I'm using honda unicorn bs6 bike. 2000km covered in 3 months with 2 free service done.
Sometimes when i downshift from 3rd gear to 2nd or 4th gear to 3rd, the gear doesn't fall correctly and make huge grinding sound with bike's rpm surging and racing. Please provide me with a solution to this problem. The bikes 4 month old

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