Sorry to hear about the trouble, we'll try our best to help you with it. Could you please share a few more details like:
The version of XD and the Operating System.
Have you tested this on a different browser? If not, please test this on a different browser and check how it goes.
Are you connected to a private network or managed network like a work network?
Will it be possible for you to share a sample prototype link so that we can test this on our end? If yes, please send the link through DM by clicking on my name. Please add this discussion link in the subject while sending DM.