So likely the intermittent issue is the default duration from which either Teradici or your Linux OS treats a key press as repeating. Do you have a PCoIP Properties application? It’s been about a year since I’ve been in front of a linux box, but, its a small app that allows you to view session statistics, set a few other preferences…one of which I believe is a repeating key. I suspect that you are having intermittent troubles with a few combination hotkeys…like alt click, spacebar pan, etc. That is likely a Teradici Properties setting where you press and hold a key and it interprets that as many key presses, not one…or vice versa.
Theres other places to look in Centos for that as well, which is a solution for the "sticky keys’ problem described and solved here…