If the Warzone Android app started crashing for you recently, you need to update the Google "Android System WebView" component through the Play Store. Google pushed a buggy version of this component which causes many apps to crash.

See https://www.androidcentral.com/samsung-galaxy-smartphone-frequent-app-crashes-fix for details.

thnx, was wondering why warzone was so buggy lately

I don't seem to be able to update it. It updated yesterday and since then it broke warzone

Neither, I just uninstalled it and that fixed it.

I had the problems this morning when I was not at home. As soon as I was back home (on WiFi) things went better. I think automatic update fixed the problem for me.
Several apps weren't working: radio, Gmail, warzone.

A system update did the job for me

Updating the chrome app worked for me. If updating webview doesnt work or you domt have the option try that.