How to check that the connection is open?

What's your idea about this issue that the event will not be caught e.g 5 hours after connecting,
When we press the F5 key (refresh) the problem will be fixed.
Is it possible for network problems ? If the problem is this, how to fix it?
E.g. sending a request to the server again for connecting

Reproduce the reported behavior by leaving a connection running for several hours and checking whether the event is caught after a network problem. Start by tracing the connection and event-handling entry points, then determine whether reconnecting is required. Done should include a verified fix for the long-lived connection case and regression coverage.

Written by the indexing model from the issue text.