Slow Application Itercom System

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Good Afternoon Everyone, i have installed new IP WiFi video intercom system, the internal Unit is connected via WIFI at the Modem/Router of my Internet Provider, the problem is this one:

When I ring the doorbell, the app opens automatically on my smartphone, but the video remains blocked with a green bar until I answer the call, at which point the video stream starts. I've tried another video doorbell system of the same model, and the problem doesn't persist.

So there are two causes: either the internal unit they installed is defective, or there's a network issue. I wanted to ask if I can use Wireshark to analyze the traffic while I'm being called to the doorbell to determine if it's an issue with the app or the network.