Hello Mario, and welcome to our community!
As far as I can see, station R5DEA has not been blocked by us. It is possible that there have been changes inside the school network (firewall, protocols?) that are causing this data transmission interruption.
If possible, could you also download and post here the logs from that Shake (instructions here: Please read before posting!)? They could provide us with a clue about what is going on.
Thank you.