Two times now my Zeus 336x42 has defaulted the boresighting back to 0,0. The first time it happened I didn't realize it until after I missed a 50 yrd shot and investigated why. It happened again the other day. Has anyone else had this problem? I've also had the unit stay powered on even with the manual switch in the off position. This only happened once and stopped when I removed the batteries. The next morning it was normal again after reinstalling the batts and hasn't happened again. It has the latest firmware and is about 5 years old with very low hours. Always stored without batteries. Armasight technical said the settings are RAM and no memory battery is needed. RAM didn't make sense but I guess that didn't matter. He said it didn't use a battery so no issue internal there.