I am facing the same problem. I found a way to resolve it, but I still don't know the impact. In the authentication settings of the network adapter, the option "user authentication" instead of "user and computer authentication" was configured. This way the user authentication remains active after the RDP connection.
Could anyone tell us the impact of this configuration?
Hmmm.. That’s an intersting issue that I haven’t encountered before. In the office we never faced such obstacles with our RDP service so far. If NAC is working properly then I think the nest idea would be into looking for an alternative RDP provider and see what works better for your needs. You can always try https://webpundits.in that has never created any issues for me, and it’s extremely reliable even in peak times. Of course that is if your problem still persists. Let me know if this service was of any help for you.