I have a Dell Inspirion 5558 touchscreen Windows 10 device.
A couple of weeks ago I noticed that the number 6 on the keypad to the right no longer works. I have attempted to remove the keyboard to see if anything was underneath and didn't see anything.
There have been times when different key strokes would be followed by the number 6. For instance, the letters 'c' and 'e' when typed in close succession in words like 'instance' or 'glance' the number 6 would appear. This does not happen regularly though.
All other keys on the keypad work fine.
Thanks and Merry Christmas!