App pops up a window for only 2 seconds

[Android Central Question]

I subscribed to a call forwarding service, ConXHub. When a call comes in, the app pops up a window with Accept/Reject buttons. That works fine. However, if I don't press one of those buttons within about 2 seconds, that window disappears. I contacted ConXHub, and they told me their thousands of users have no problem with the app, and it must be an issue with my notifications. I'm running Pie on a Galaxy J7.

 

[B. Diddy]

Welcome to Android Central! Is it a banner notification at the top of the screen, or a toast notification in the middle of the screen?

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