5.2 super buggy

guys…….

I’m having some issues after 5.2 update. FYI I reverted back to previous version of WP…

Now (before update I didn’t have any of these problems) when I try to use the customizer and try to publish, I get this error, “Looks like something’s gone wrong. Wait a couple seconds, and then try again.”

I also get these nonce errors when trying to install a plugin where the screen goes grey….. and then it says i need to activate the plugin, but when i scroll down, i can see the plugin activated already…

WHat is the issue I am experiencing here? This all started after I updated to WP5.2..

CAN SOMEBODY PLEASE TELL ME