Every few hours my sites turns into this

Hi,
That it is the mobile theme version that it is display on desktop, normally, this situation appears when you are using a cache plugin that it is not recognizing that you are using a mobile theme too, and is not knowing what cache version to deliver (for mobile or cache, therefore it is deliver the latest one).
To avoid those problems we recommend to use the WP Super Cache plugin with those settings -> https://forum.tagdiv.com/cache-plugin-install-and-configure/
I hope this will help you!