When I run mednafen, it crashes/sleeps after only a few minutes of no input. If I don't press any keys for a few minutes, the screen goes blank and I can't get mednafen to start up or return to the command line or anything unless I reboot the pi. I've looked through the mednafen online documentation but can't see any info on an auto-sleep or suspend function or anything like that.

Has anyone seen this behaviour before? Any ideas what I can do to fix it?