Hello,
5) Try to add the code below to Custom CSS to fix the header flashing
.cart-widget-show #header.sticky[data-type="smart"]:not(.sticky-on) > [class*=header-wrapper] {
animation: fadeIn .3s ease-in-out;
}
#header.sticky[data-type="smart"]:not(.sticky-on) > [class*=header-wrapper] {
animation: none;
}
6) Contact your hosting provider to make scheduled backups of all your files and DB.
Regards