Share your experience!
I have the exact same problem.
Had the same while on Lollipop which was fixed with an update
Now same SD card corrupted issue with Marshmallow update
Same here 
I feel you..same issues im getting...bought new samsung evo 64gb class 10 for this sd card issue...
Me to mate, I had the same problem(s) been waiting for a patch of some sort for it to bee ok, but nothing have happend. Even Sony knows about this problem. About time they fix it. Im about to send my phone for service. Sony said i could and i will
Apart from this:
Is there any way I can go back to android L.