Diagnosis
Network latency. The signal must travel from doorbell to Sync Module to router to Blink cloud servers and then to your phone via cellular or Wi-Fi. Delays are common in this chain.
How to Fix It
Optimize your local network. Place the Sync Module as centrally as possible, using a wired Ethernet connection to your router. This creates the most stable hub. Ensure your router's firmware is up to date. Reduce the distance between your router and the doorbell.
If That Didn't Work
Check your phone's notification settings. For the Blink app, ensure notifications are set to 'Immediate' or 'High Priority'. On iOS, disable 'Deliver Quietly'. On Android, disable battery optimization for the Blink app.
Heads Up
If your phone is in a low-power or sleep mode, notifications can be delayed by the operating system. This is a device-level setting, not a Blink issue.