I assume this is on a PC or Mac? Since it sounds like you are at work, there may not be much troubleshooting you can do, but I’ve seen this sort of issue with browser or browser extensions issues.
If you can, back up your bookmarks or other important data and uninstall Chrome or whatever browser you are using. Restart, then reinstall the browser from a newly downloaded installer. Try running the browser without any extensions and see if the problem continues. If it does, there could be RAM or GPU issues causing it (less likely in my experience).