Sometimes (not each time, but lets say it happens roughly 1 out of 8 times) the whole menu bar disappears. No logo and no menu items are shown, still there is some functionality and the sub menu can be used on an menu item. It happens on iPads with using Safari as the browser.
Other items are then also not showing up, for example the accordion section shows the box and the plus sign and can be used, but no text in the box is showing up.
In addition (and maybe it helps to figure out the issue) when the menu bar is disappearing, then the two links “Datenschutzerklärung” and “Impressum” in the footer of my page are also not showing up.