Velenje, basically, QT detects disconnects and automatically reconnects, switching servers if needed. Normally if you have 2 instances running, they will automatically adjust so one is on one server and the other is on the other. But if you have more instances running than there are server IPs for TDA servers, or if for some reason there is a problem accessing one of the IPs, then having the 2 instances running at the same time would cause a problem.
If you see constant reconnects, try shutting down one of the QT instances.
I don't see any issues here, though I really wasn't looking that closely.
Jerry