Suddenly, Java.exe will only run for 10 seconds. Cannot play Minceraft

I don't know why, but I was playing Minecraft just fine two weeks ago, and now this happened. I would attempt ta run Minecraft, and it would start running, and then stop. And I don't mean "start running" as in the launcher opens up, but that there's a task running in TaskManager fer all of 4 seconds, and then it turns into java.exe, and then 6 seconds later it loses all of it's CPU usage...