I'm a fullscreen purist and I used to get the Render failed all the time.
Recently I started using /viewport to get the classic 4:3 experience. A great side effect of this is that I have had zero Render failures since.
One note.. sometimes in fullscreen like this, clicks on the edges of the client would bring me to the desktop. What I found stops this is every time I go fullscreen is clicking a macro that "cycles" /viewport like so:
/viewport reset
/viewport 240 0 1440 1080
(I play with 1920 x 1080 settings, same as my desktop, if this helps).
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