Certain keyboard keys don't work Acer Aspire V3-571G

Hello,

A few months ago I began to have issues with my Acer Aspire V3-571G-9435 where certain keys would intermittently stop working. Most often it would be the "A" key, along with less frequently the "C" and "Z" keys, and somtimes other keys. Within a minute or so they would start working again.

A couple weeks ago, however, several of the keys, including the "A" "C" "Z" "F" "," "." and some other keys stopped working altogether (all at once). Following some guides I found online, I took the laptop apart and was able to take the keyboard ribbon cable out of its connector and put it back in, thinking it may be a loose connection issue. However, this did not fix the issue.

I went online and ordered a new keyboard from Amazon, thinking the keyboard itself might be broken. After installing the new keyboard however, and entirely NEW set of keys have stopped working, including "J" "Q" "T" "U" "P" "1" and a few other keys. (However most of the keys that weren't working previously are working again).

Does anyone have any other suggestions about what I should do? I've been using an external USB keyboard, which works fine, except obviously portability is sacrificed. I'm unsure if this is a hardware or software issue, as a brand new keyboard still isn't working properly. Could there still be something wrong with the connection? Is there a possible software/diver issue?

Thanks for any help.