I also had a Cubase license on an old, long dongle. It worked fine on my desktop PC but led to random dropouts on my laptop. Cubase frequently stopped working there during a session because it suddenly wasn’t able to detect the dongle any longer. Really annoying. After transferring the license to a new, short dongle the issues went away. I don’t know if the old dongle was defective or if the model just works less reliably on newer machines.
A colleague with similar issues was able to fix them too by replacing the long dongle with a short one.