Kami stops displaying annotations

Dear all

I’m using an Asus Chromebook flip - when working with Kami, after 10 or so minutes it will suddenly stop displaying annotations. Also, when opening an annotated document, the display can have a meltdown,oscillating and flashing (just the document - not the chromebook!) I then need to reload the web-page to make it work again but I’m concerned I won’t be able to do this when offline! Bug? Is there a fix?