I just purchased an a6000 with an 18-55mm lens (model SEL1855) and a 55-210mm lens (model SEL55210). When using the 18-55mm lens, after taking a few shots, I get an error message: "Check that a lens is mounted. For an unsupported lens, set "Release w/o Lens" in the menu to "Enable"."
The problem goes away when I reset the camera only to reappear after a few minutes. I've cleaned the contacts gently with a pencil eraser and there's no sign of any damage. Any help is much appreciated.