Every focus option quits on AR11

[Old Dog]

Twice now my camera has basically shut down all focus options, informing me the lens is either not attached properly or the camera does not support the lens attached. As I am only using Sony lenses (the GM 85, 70-200, Sony/Zeiss 35 1.4, or 55 1.8, and Zeiss Batis 25) this message clearly wrong. 

 

The camera, purchased through the Sony Store (since closed), is under warrantee so Sony has me send it to Precision Camera for repair. Both times the camera comes back in fine working order but Precision Camera does not give any detailed information as to why this focus problem occurred. (The Sony customer support rep suggests it has something to do with the focus mount). The issue for me is I am losing confidence in the camera's performance and am wondering if this particular camera is a lemon. To be in the middle of a shoot and have a camera go down is both frustrating and costly. 

 

Any one experiencing the same issue? 

Thank you