TEMPORARY SOLUTION: Having experienced this error as well, most answers talk about the problem being the small cracks in the relays that are breaking communication during the spin cycle due to vibrations. I don't have the 2-3 hours right now to take the machine apart and fix it because today is laundry day...
Instead, i folded a couple dish cloths and put one under each foot of the washing machine. They act like little mini shocks and keep the washing machine from jolting around during the spin cycle. 4 loads so far and no F11 - so at some point i'll have to get in there and resolder the relays, just not today.