Windows 10: Built-in keyboard in laptop randomly stops working / no response

Ok, so recently I found my Toshiba Satellite laptop keyboard sometimes stops working. Nothing at all. The number lock light stays on if it is on but no response from any of the keys....This happens sometimes at boot but sometimes it happens randomly after a successful boot. It can work for any amount of time and then stop working. On average though it usually happens within two hours though but can go all day before it happens again

I decided to take the nuclear option and reformat because I thought it was a virus.

So, after a reformat everything was good and then it started happening again. I haven't installed any software since reinstallation of windows.

I have another USB wireless keyboard and when to use that it works properly but the built-in one still doesn't work until I do a reboot and sometimes even after a reboot it doesn't work.


So what could this be:

1. My computer is 5 years old. Could it be that a dying CMOS battery could affect the keyboard and make it randomly stop working?

2. I also surmised that maybe there was a windows update that affected the keyboard but I haven't seen anything that relates to keyboard or other motherboard drivers being installed.

3. Or could it be the keyboard hardware itself, is it failing somehow? But why would it work properly sometimes after a reboot?

4. Or something else? that's why I came here to ask for suggestions or direct solutions



I appreciate any guidance on helping to solve this frustrating issue

PS:

I tried to use Event Viewer to see if there is an entry that would show if Windows has reported/noticed the keyboard malfunctioning but I don't know where to look in Event Viewer, it's above my technical ability to know exactly where to look. I have tried but I don't see anything obvious.



System Information:

System Model Satellite S50D-A

Keyboard Driver c:\windows\system32\drivers\i8042prt.sys (10.0.15063.0, 112.50 KB (115,200 bytes), 2017-03-18 5:56 PM)

:)

 

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Several factors may affect your Internet connection that may potentially affect its performance or for it to stop working randomly. To better assist you, we would like to ask you a few questions:

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• Have you made any recent changes on your laptop prior to this issue?
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There are different factors that can contribute as to why your laptop's built-in keyboard is not working properly. This could be caused by a recent update that was installed or device drivers that got corrupted. For us to resolve your concern, kindly answer
the questions below:

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