I own a TVS Apachi, 2007 model motorcycle. I am encountering a lot of

I own a TVS Apachi, 2007 model motorcycle. I am encountering a lot of problems off late. Over the past 2 weeks I have already changed 2 spark plugs.
The bike does not start. The moment I put a new spark plug, it starts and everything seems to be fine. I purchase the plugs from Lamington Road for Rs. 80.
Please advise

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