Ring Hardwiring

HiI have recently been obtained significant drain (10% in 3 days) on a new ring doorbell 3 despite being hardwired. I wanted to rule out hardwiring issues. So i checked this transformer output using a multimeter.This is my [transformer](https://www.bgelectrical.uk/public/downloads/data-sheets/devices/CUB1.pdf)It's currently wired on pins 1 & 4, hence I expect a 24v output. However, the multimeter was indicating a voltage of 30v. I performed readings on the rear of the doorbell and at the transformer itself (pin 1&4), both give 30v.Do I have a faulty transformer, or is this normal?Should I lower the voltage to 12v?Many thanks,