Not Ranked
When you first push the starter button, can you hear if the relay engages? If not, put a voltmeter at the solenoid and see if you have the 12 volts there when you push the button. It could be just a worn button contact. By it being intermittant, I would check that the button contacts haven't burned or worn first. If you have the voltage at the solenoid immediately after pushing the button, then it would point to the solenoid. If not, then either the relay or button or possibly a loose wire or connector.
Ron
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