I assume the session was left in disconnected state, and when you reconnected after 2 weeks you found it unresponsive?
Do you still have logs from that session? More info on how to gather logs here: https://www.nomachine.com/AR07K00677. They can be sent to forum[at]nomachine[dot]com.
Finally, if the session is still running, please do a test: try to reconnect that session by double-clicking on the icon representing the session but, while doing so, keep Ctrl+Alt pressed. This will make the session is reconnected in “shadowing” mode. Let’s see if user input works with the different protocol.