If the connector contacts had issues once, then the connection issues will return again shortly. Once connector corrosion starts, it's simply a waiting game. There are anti-oxidation products made especially for electrical connectors that are inexpensive and easily applied. These can prevent the return of the issue. One of the best is a product called No-Ox-Id by Sanchem. The small 7ml tube is enough to do 20 lawn mowers and 3 motorcycles. It simply takes the smallest amount.
It's also fantastic on battery cable connectors.
It's also fantastic on battery cable connectors.