most complaints of this nature turn out to be a mouse in it's death throws

Thanks for getting back to me. The mouse is only a few months old, and ai change the battery's this morning, with the problem remaining.

...and I changed the...

It you have a wired mouse try that... cordless mice while great (I use one) have some nasty habits. They operate on the same 204Mhz frequencies as baby monitors, cordless landline phones, cordless dorbells, WiFi networks and other cordless devices (two Microsoft Mice in a cubicle arrangement can cause interference with one another, even though they are supposed to sort that out themselves it does not always happen . They are also prone to interference from household items such as Microwaves.

Thank you. I removed the wireless mouse from the computer, installed a wired mouse, with the same results. I relocated a wireless land phone (unplugged it), that was near the computer. The results were the same. My wireless router is on the first floor while my computer is on the second floor.

I even removed all mouses and just used the arrow keys. Same result.. Any other suggestions would be appreciated.

Thank you for your time

also, this does not happen while typing in Word 2013, only on e mail. Some I am wondering if it is a firefox thing.

I've noticed that it usually happens while autosave is running while I'm typing, so it may be a bug in autosave. Can't find hoe to file a bug for TB