A pop-up it's saying it's going to shut down my

Hi,

What is the model number of the tablet?

Try starting the tablet in safe mode and check if it still happens. Search online for Samsung (inset tablet model number) safe mode to find out how to do it for your model.

If it works OK in safe mode a downloaded app is the cause of the problem. A downloaded app is one that you downloaded and installed on the tablet and didn’t come pre-installed with the tablet. You would need to uninstall each downloaded app one by one and test the tablet in normal mode between each uninstall until it worked OK. When it does then the last downloaded app that was uninstalled was the culprit.

Alternatively you could try downloading, installing and running an anti-malware app (example only) and check if it finds the cause.