Are you using 4.10 or older?
If you mouse over the Connect node, you’ll find:
For 4.10 (and older):
If you have a socket connection in a game instance, and you switch levels/maps, the ticking of that socket connection will stop.
If that happens, check if the connection was connected by calling IsConnected().
If that returns true, call Connect() to reboot the ticking.
This has been fixed since 4.11 preview 7.