Echo device announcements only work some of the time

I have my echo devices (2 dots and a spot), and firestick (4K max) all setup to receive alerts when the doorbell (pro 2) is pressed. However they only seem to work about half of the time. For example last night I tested it 3 times across the space of about 15 minutes and every time all 4 devices alerted. This morning I tested it and none of them did. Notifications on my phone work every time so it seems to be the integration into Alexa that breaks. All of my devices have strong signal (its only a small house) and the internet is plenty fast enough. I've tried unlinking and relinking the camera, resetting devices, checking for software updates etc but I just cannot get it to consistently work. Any help would be appreciated!