Battery issues

Hi guys,Having a bit of trouble with our 2nd Gen video doorbell. This is our 2nd ever charge on the device and every time we plug the charger in, the device settings automatically changes it to hardwired when all we want to do is charge the battery. (Our device is not hardwired we simply charge it) and when we remove the charger it switches back to battery. There is no option for which power source we want to use in the settings. When plugging it in to charge the ring will flash as normal and then all of a sudden it will flash on and off at random times making it look as if someone is turning the charging power on and off?Any ideas how to fix?Device is only a month old - was a Christmas present.