I don't see many other threads about this issue, so it could be on your end.
I don't work for EA.
Try rebooting the console completely off and on again. It will force new servers. Are you having problems with every mode or just certain ones?
Track known issues and learn about workarounds or fixes.
Check on the latest updates to Plants vs. Zombies Garden Warfare 2.
Reset, update, or link your account information.