Doorbell not working at night

I’ve had my ring doorbell 6/7 months now. All was working fine until around 4 weeks ago. It has stopped detecting at night. It still detects motion, as the red lights either side of the actual doorbell come on but no alert to mine or my wife’s phone. I’ve rang customer service and went through some troubleshooting, but as they close at 7pm , and it’s after that when it stops working so can’t go through it with them whilst they are open. Any ideas. Thank you