RDS frequent disconnection in Dell 5070 Thin Client

We are facing issues with this Dell Thin Client 5070 Model for RDS disconnection, The RDS will go & come up after few seconds every 1 or 2 minutes. Users could not work like this & it irritates them. There is not solution to this & it is happening with this particular model only however we have other old models also where we do not face issues. It will happen with 2-3 system everyday. We tried everything from checking ping status to changing lan cable & formatting the system with the flash drive available of Dell & updating drivers & BIOS. Can somebody help ?