The other day I say a trail of water in the garage leading from the direction of the water heater. I was not sure if it was coming fromt the heater or from a nearby water bottle. When I returned home from work the trail of water was still there (convinced now, that it was not from the small water bottle). Underneath the hot water heater, the wooden board the heater sits on was wet. However, this morning (two days later) everything is dry. Is it common for a heater to leak, then stop?