UserAgent: Mozilla/5.0 (X11; CrOS x86_64 11021.81.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36
Platform: 11021.81.0 (Official Build) stable-channel quawks

Steps to reproduce the problem:
Update to latest stable build

What is the expected behavior?

What went wrong?
Keyboard 'c' button stopped working after latest stable update. 

UI frequently registers repetitive 'c' presses although the key is not being pressed 

Did this work before? Yes 70.0.3538.76 

Chrome version: 70.0.3538.110  Channel: stable
OS Version: 11021.81.0
Flash Version: 31.0.0.148 /opt/google/chrome/pepper/libpepflashplayer.so