Dual QGC, one QGC is not responding to commands

Let's say 2 QGCs are connected to UAV. One is herelink and the other is connected to mission computer running mavlink-router and one is not responding to commands

Resolution here is do not

1. switch modes on herelink

2. restart qgc on herelink to form connection

3. you can also restart mavlink-router on UAV to reestablish the connection