I have a yamaha fz v3 , the problem I'm facing is the bike turns on an

I have a yamaha fz v3 , the problem I'm facing is the bike turns on and off by itself and the speedometer even if the bike is standing shows imaginary speed readings, I've already given my bike to service centre 7 times still they're not able to find any solution to my problem. Kindly look into this problem, i have videos of the same problem if you want for reference.

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