OK these guys are enjoying your pain. Slab made some upgrades and changes a few weeks back and several folks, including me experienced hard key typing, enter key not working, slow response etc.
The fix he suggested was to go to the tpo left of your screen and select 'Settings". then scroll down the left side til you come to "my account', select "general settings" and then scroll down til you come to "Miscellaneous Options" then select "standard editor" then scroll down and click "save changes"
That fixed all my issues. Apparently in doing the upgrades, the software changed the "Editor mode" on a number of members.
Hope this helps. If not, you may have to take some of the other advice. Let's hope not.