I was running a simulation on ANSYS MECHANICAL PREMIUM and in the middle of the run i got an error "An unknown error occurred during solution. Check the solver output." I checked the solver output and found there was neither any warning nor an error msg as shown in the attached image below. My solution didnt hand any bisection/divergence issue it was converging nicely as you can see in the attached image. I also got an error message something like "ANSYS SERVER LICENSE LOST" and for few minutes I was not able to access Mechanical.