I installed the User Behavior Analytics (UBA) and seemed to work fine. I had the appropriate amount of RAM and performed well. I went into the systems settings and changed my timezone, restarted, and saw that UBA disappeared from the top tab but was still in my extensions. I uninstalled the extension and reinstalled it and seemed to work and had all my customizations.

I turned off Qradar (from system settings) and increased the RAM of QRADAR and saw that UBA disappeared again. I tried to uninstall and get "Failed Extension uninstallation task for extension id 151".

How can I get this to show up again and working properly so I don't have to reinstall it for it to work

Try clear browser cache and another browser. I have seen this before after an upgrade.

That did not work. I also tried on other machines and restarted QRadar by going to Admins > Systems and License Management > Restart . Seems to be happening with other extensions now as well