Keyboards jet lagging and dropping letters

This is too much to be a coincidence. I had one person call two hours ago saying when he types (any program) the keyboard will sooner or later jet lag, just momentarily, and what he was typing will miss 5 or 6 characters.

One hour later a lady called from a completely different company with the exact same issue. Too strange. Has anyone else come across this?

Interestingly enough both are Windows 7 Professional 64-bit.....
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Could the Filter Keys function be accidentally switched on?

1.Click Start → Control Panel → Ease of Access Center.
2.Click “Make the keyboard easier to use”.
3.Un-check the box labeled “Turn on FilterKeys”.
4.Click “Set up FilterKeys”.
5.Un-check the box labeled “Turn on FilterKeys when right SHIFT is pressed for 8 seconds”.
6.Click the OK button twice.

Could you try using another keyboard on the same computer? Is the keyboard wireless?

There are some steps you can take:
RaminTechnical AdvisorCommented:
It can also be a delay between  Display driver  and key board.  
Can you check for any similarity on those PCs (for example: WIFI and LAN on both PC may be  enabled) or even the same Graphic Card / low Disk Space / available RAM / Antivirus.
usually i attribute this to a temporarily action of the pc, when it is heavily used, like : downloading and installing updates, for windows or other softwares
can you exclude this?  then we can look into other posssibilities
LockDown32OwnerAuthor Commented:
The problem seems to have corrected itself.
Thank you for the grade, nonetheless. Good luck!
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