Keyboard suddenly stopped working!

Dear Apple Team and Community

I am experience some continuous and irregular problem with my MacBook Pro 13,3 from late 2015.

The problem happened first just about a year ago.

If I remember correctly I was typing something on my computer at the time when my entire keyboard stopped responding and working. It was a sudden change, and I thought the computer had froze or something. I soon realised something was wrong with the keyboard. The strange part was that I hadn’t spilled any liquid on it or kept it in a humid place.

I will remind you that my computer is now 7 years old and works perfectly, the only complaint I have is to (storage space).

After that first incident the keyboard started working again the next day, but then a day or two days later it stopped working again.

Ever since the first incident the keyboard has been acting this way on and off. At the beginning it was just days before it started working back again, but then later it will go 1 week between each time. 

And now….it can go anywhere from 2-5months between each time

It is worth mentioning that the intervals are irregular, the only key that is working is the (power) button. The lights on the keyboard are not on either. There is no sign to any blown, or heated battery either.

so…at the moment I am using an external keyboard with USB receiver plugged in to the computer