I have had my 2011 Edge Limited since early March. EVERY day on my drive to work, the BLIS system locks up and says the sensors are blocked. They reset after about 15-20 minutes, but by then I am getting off the highway, where I really could use the help. It NEVER happens on the way home. It NEVER happens on the weekends. It NEVER happens if I take a different route to work. Just fails on this one road - three lanes in each direction, center median (grass) and light traffic (sometimes a vehicle beside me and sometimes not.) It doesn't happen in the same spot, just randomly somewhere along the 3 mile stretch.
I have called the dealer three times about this (first time he suggested the car was dirty - nice try.) I have taken it to the dealer twice. Every time they say the update is not working or not ready, so they haven't tried to update my SYNC/MFT to a newer version. I have version 2.4. BLIS has alerted me a couple of times when I truly did not see a vehicle beside me, so I know it will be helpful when I get it working consistently. Right now, I just enjoy it on the ride home and ignore it on the ride in. If I am lucky, I will hit a red light just after it locks up and before I am on the highway and I can shut down the engine and restart to reset the system and it works for the rest of the ride into work. But that has happened only a couple of times.