Random insertion of letters into typed text

[BK42]

When typing in Word or text in emails, sudden insertion of letters occurs. Am I unwittingly using a command? It happens sometime during almost every session.

Help please. Thx

[macropod]

This kind of thing usually happens when you're using a laptop with a touchpad that you accidently brush while typing.

[BK42]

Thx for the reply. Unfortunately, I don't believe that is the case. Certainly it might explain some insertions but the curious thing is, it seems to occur often when I type "th" - does
this suggest a macro I am unaware of and if so, how to fix?

Thx