Hi,
I have the problem, that the customizer suddenly keeps in a refreshing mode every second.
I deleted all plugins, did not help.
Then I deleted the theme, the other themes don’t have the problem but as soon as I reinstall the theme it happens again.
I even deleted the whole wordpress installation and made a fresh new setup. First it worked but then I came to the “Homepage” Settings and now it is refreshing again.

My log is showing this:

VM4506 jquery-migrate.min.js:2 JQMIGRATE: Migrate is installed, version 3.3.2
VM4557 jquery-migrate.min.js:2 JQMIGRATE: Migrate is installed, version 3.3.2
VM4608 jquery-migrate.min.js:2 JQMIGRATE: Migrate is installed, version 3.3.2
VM4659 jquery-migrate.min.js:2 JQMIGRATE: Migrate is installed, version 3.3.2
VM4710 jquery-migrate.min.js:2 JQMIGRATE: Migrate is installed, version 3.3.2
VM4761 jquery-migrate.min.js:2 JQMIGRATE: Migrate is installed, version 3.3.2
jquery-migrate.min.js?ver=3.3.2:2 JQMIGRATE: Migrate is installed, version 3.3.2
'

Can you help me?
Kind