I've seen this since the very first CP4N we installed right after they came out, and your experience sounds a lot like mine. In S+, you can leave it to stay connected and automatically reconnect and it'll work, but a TCP Client symbol gets stuck waiting. Restarting the program is enough to get it working again. I've tried various catch-and-recover methods that seem to have worked, but I've been trying to make or use S+ or S# modules to handle TCP stuff anyway so I notice the issue less and less as a result. It's definitely not just you it's happening to!
