I've been using Modelsim Starter Edition 10.5c when at exactly 5 minutes, it would force close and return an exit-code of 4. Code 4 is related to licensing-issue. In the transcripts, it says:
FATAL ERROR: Unable to read lock file necessary for use of uncounted nodelocked license. Exiting.
Since I'm using the starter edition, I was just wondering which license they are referring to. My project does not exceed 10k lines.