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Hello, I'm Tan. Welcome to JustAnswer. I'm reviewing your question and will reply momentarily.
Remove the relay and inspect the relay connections for any corrosion. Clean and make sure to use some dielectric grease on the connections when you reinstall the relay. If you still have an issue we will have to remove all the connections from the relay holder and replace the connectors.
Can you post a pic of the relay holder? I might be able to see an issue.
Ok is the start circuit acting up now?
Ok without wiggling the relay check voltage on the yellow/red terminal of the start solenoid on the starter when key is in crank position. What is your voltage reading?
This is an indication of a bad connection. We need to verify the voltage to the relay when it is acting up. Test voltage on the red wire when key is in crank position. What is your voltage reading?
We can't assume anything. This could be poor voltage supply to the relay. This is why I ask to check the connectors. If one of the connectors is loose at the relay it will cause resistance and start issues. The only way to know is by doing the tests I outlined.
No click or no noise is no voltage due to bad wire or connections.
Ok let me know what you find. All symptoms point to connections at the relay.