The dayz server UK 5-50 respawned wednesday after the weekly maintenance. No wipe on it, persistence ok. I suppose something went wrong during the previous weekly update and for a reason, the server didn't start.
Thanks for your answers guys.
Strange for the 5.51, maybe something similar occured on it ? Or maybe they started some sort of server turnover for economic reasons... No idea. The boring part in my opinion is the lack of communication about this.