Deone 0 Newbie Poster

Hi..Hope I am the right place! I use the chat function in Gmail heavily. In the last few days, something triggers the letter .c to type itself repeatedly until "It" decides to stop. I highlight, delete it and continue with my chat. It does again and again when ever it feels like it and at vastly differing durations. I have no experience of this ever happening.

I bought a wireless Logitec keyboard and mouse.......last week as well....could this be creating the issue?

Thanks in advance for any clues Deonem (Brand new here).