Blynk disconnect on project with auto mode

Iam working with a robot controlld by both auto and manual mode
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does i have to assign any button for this code in blynk app with v5
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while adding a pin to this i guess ia can change to automatic mode but when i press the button assigned for this code initially the motor runs and i am done with the wifi connection.
here is my code any one plz help me with this.

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Please edit your post, and add triple backticks ``` before and after your whole sketch.