2011 Toyota Sienna Stalling Problem

As previously mentioned, our 2011 Toyota Sienna stalled when I stopped at the ATM to get cash last Thursday. The van stalled again several times when I was stuck in traffic. I drove the van straight to the dealer where we bought it. The dealer couldn’t figure out the problem so it contacted Toyota. Toyota suggested to replace the fuel pump. Today the technician called and notified that the fuel pump was replaced, but the problem remains unsolved. So now the dealer has to work with Toyota again to see how to get it fix. Any Sienna owner ran into this problem?