Keyboard unresponsive after sleep mode?

I have a Lenovo L440. It was working fine and then at one point i opened my laptop and the keyboard stopped working. I reset the laptop and it worked fine afterwards. However, now anytime i close my laptop, and open it again later the keyboard is always unresponsive, so i need to completely reset the laptop again for it to work. Is there anything i can do to fix this, or at least, be able to keep the keyboard on while in sleep mode?