I had the same problem, I flashed the 34xx firmware once again and it solved the problem. If simply re-flashing the firmware doesn't work, do this : run garmincure and cure the firmware, then flash this firmware to the nuvi. Afterwards, turn on the nuvi a couple times and let the logo boot and turn off. Then, turn on garmincure and revert the firmware to its original state and flash it back to the nuvi. I did this and it worked, and the logo doesn't jump anymore.