Hello: Heaters can leak from anywhere and the leaking can be intermittant. It sounds as though pressure is a concern, so I’d go get a pressure gauge and monitor it During the heating cycle particularly, if pressure ever goes over 80 psi, you need to take steps.
Also, the anode in your heater wants to be checked. If here is little or nothing left, there is a good chance of damage to the tank. Do check everywhere else also for water. For example, it could be rain coming down a vent pipe 😉