Hi, we recently bought 4 licence for SDL Trados. We installed and activated the software successfuly on 4 computer about a month ago. Since yesterday, one of the licence has stopped working. When we start the software we get a message " Licence has expired please enter an activation code."  I went on our web portal and everything seems to be OK. I tried to re-enter the activation code but we are getting the same kind of message.  Should I try the reset licence Button ? Do you know why this particular licence has stopped working suddently ? 

Thank you !