That has happened to me a couple of times too on my Tenere 2011. First time was freaking scary as I came down a very steep and twisty road and had a pillion. But luckily front brake and engine brake was sufficient.
From what I understand brake fluid will condense a little and when its water in the brake fluid it will boil more easily and you will loose its function and the pedal will go straight down.
Best would be to change brake fluid as noted in the manual and maybe even more often, depending on how much you ride. And in long steep downhill sections try to use front brakes and engine brakes more than rear brake.
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In the end everything will be fine. If its not fine its not the end....
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