Certainly check out any recalls & such as CSA mentioned.
Other than that small evap leaks aren’t uncommon - but are uncommonly hard to find. The first thing to do is not just make sure the gas cap is tight, but also inspect the filler neck for any kind of issue - a small dent or scratch or some kind of crud stuck on it. Also inspect the gasket for the gas cap. New gas caps aren’t that expensive. You can just get a new one.
If nothing about the gas cap is found to be a problem then the easiest way to find the small leaks is probably to have a shop perform a “smoke test.”