Doorbell LATE in alerting

I have 3 doorbells, they take over a minute to alert me to someone at the door, in the yard, etc. And I know this because it goes off after I am back inside my house and sitting down. It goes off and I think, who popped into my yard that I didn't see?? They are freshly charged. HELP! (and we had new fiber internet installed recently. It's been going on since before that)