Hi @KimberlyH954, it sounds like you may be running into some connectivity issues when trying to unschedule a campaign. Lets start with some basic connectivity troubleshooting. If none of those alleviate the issues, could you please provide a screenshot of your speed test, including the More Info section? Once we have that we can do some more advanced troubleshooting as needed.
If you continue to run into that issue when using spell check, I would start by looking at your Spell Check and Grammar settings in your browser. You may want to enable or disable how they currently are set up, or just modify the settings.