I get an error message in the display saying that there is no connection between the body and the lens. Sometimes when I restart it starts working for some pics, other times it's working at all. Yesterday I should take some pic outdoors and it would not work at all. Now when I test it at home, it works all right. Somebody who can help, have some toughs about the problem. I have never had this problem with the lenses following the camera pack. I have also tested another similar lens from Tamron with the same problem.
Dirt/Grease/or corrosion on the contacts where the lens and camera connect would be the primary cause of any communication problems, multiple lenses imply the camera body may be the more likely culprit. You can research online, likely just a little dab of isopropyl alcohol on a cotton swab probably is all that is needed to clean all the contacts. I would start there first.