I'm back with my car key! 2x attempted repairs, but key stops working again between 2-12 hours later, what could it be?

A subreddit for practical questions about component-level electronic circuits: design, repair, component buying, test gear and tools.
I washing machined my car key fob, what is this waxy/glue like blue stuff?

A subreddit for practical questions about component-level electronic circuits: design, repair, component buying, test gear and tools.