GTX 960m fps problems

Hi guys, I'm having some fps issues with my laptop. Im using an i7 4750hq and a gtx 960m 4gb, 8gb ram and a 500gb 850evo ssd. Since january the game has been running really bad. I running everything on medium and somethings are off. And in fights i get like 35 fps. Before I was running everything on high or more and never dropped so much frames. Just for reference Im running the latest drivers for hots 2.0 and im in maximum performance mode. Please help me out, I really dont know what I could possibly do.