Black Screen while browsing

[Totalitarianism]

Hello everybody, 

I want to apologize for my English grammar in advanced. 

I recently faced this problem with my laptop, which is Lenovo ideapad 310-15isk. Laptop freezes while browsing so randomly and rarely (once in 2-3 weeks). When it freezes, the screen goes black but not completely, the screen is still flashing light from it but buttons like CapsLk or Num Lock freezes also, I cant turn them on or off. Also, the only way to "unfreeze" the laptop is only by pushing the button. What is more, I am not sure this problem is caused by high temperature because when I check it, CPU is usually up to 33 - 41 ºC.  What could be the problem and would I be able to solve it myself? 

Thanks for your answers!