When I type, both lag and duplicated letters

Catalina 10.15.7
Scrivener 3.2.3

When I type, there is a lag on and off and some letters are duplicated.

thank you

example of approval below (no problems typing the same word in other apps)

thank you

image

step 1, reboot. step 2 search here if issue previously reported and solved. step 3 if continues check Activity Log to see if some process hogging CPU.

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OK thank you for your reply

This might not be relevant, but have you tried using another keyboard?

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good point. I will look for one in the mess in my office. thanks very much

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I will try this first in apple → sys pref, and them go on a hunt for another keyboard. thanks again

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