Ring Doorbell 2 melted doorbell chime

We have had our doorbell 2 for about 2 weeks. Last night, it sounded like the doorbell rang but nobody pushed the button. Shortly after, we smelled a burning smell. I tracked it down to our original doorbell chime. It was stuck in the "on" position as if someone was holding the doorbell button down and melted one of the rubber rings. Is this going to be more likely an issue at the doorbell or due to the transformer?