One of my MX key fobs stopped working this winter and the other key fob had a low battery warning so I went ahead and replaced both batteries. They were more than two years old. After replacing the batteries neither fob worked. I ordered the same type of batteries and tried resetting them a few times. Today I took both keys to Tesla and they said they also could not get them to work and would order replacement keys. This seems very strange that both fobs would completely stop working after a battery change? I suppose one could have died before but seems too coincidental. Has anyone experienced this or any ideas of how to bring them back to life?