DEFECTIVE INSPIRON 11 3147 LAPTOP KEYBOARD

hello! 

I own a dell inspiron 11 3147 laptop. I've only had it for almost 2 years. My current problem now is that certain keys in my laptop keyboard won't work. So now, I mostly use my touch keyboard if I have to work on papers. They keys that aren't working are the ff: 4, 5, r, t, f, g, v,  and b. As you can see it seems to be that the whole two columns that these keys belong to are not functioning. I've updated my drivers and I recently installed the latest Windows 10 update. I installed it last July 9, 2016 so it's very recent. I thought that maybe after instaling the new updates, my keyboard will go back to normal but it still hasn't. 

Also, sometimes I get very impatient so I tend to press down on the keys a bit too hard. And when I do press down on "R" and "T", my screen just goes to black and I have to restart my laptop. This should mean that it's a hardware problem, right? Or can it still be a software problem?

Please help! I've had this keyboard problem for months :(

Thanks!