I frequently see a very similar problem on my laptop
. Something fairly often causes my system to run pretty hard, the fan kicks in and the processor is obviously warm.
I don't usually see the typing problem on CF, instead it shows on my company gmail based system where the cursor will lock up and nothing I type shows up. Doesn't even go into the buffer and show after a few seconds, just totally locks and will see nothing for several seconds. CF is usually running in a second window but I had not considered it might be the source of the problem. Was guessing antivirus scanning in the background or maybe even a virus that got around it.
When this happens I sometimes run Windows Task Manager and look at CPU activity. I see several iexplorer processes that are usually bouncing fro 0 to 3-5% but occasionally and briefly jumping to 7-10-15%.
Think I will start closing CF when I hit the lockup and see if it goes away. I had a hard drive crash and had to reinstall everything a few months ago and didn't reinstall adblocker Maybe time to do that.