[Elecraft] K2 - No Menu

[Ed - ad7gr]

When I tap the [MENU] button on my K2 nothing happens, the menu is not 
accessed and the display continues to show the frequency.   All other 
buttons work correctly.   Tapping [MENU] brought up the menu this 
morning but not now.   Just before this issue I had pressed [TUNE] 
thinking that I still had the ATU enabled, but it was not and I had to 
turn the rig off to get the k2 to return to RX.
Has anyone had this happen?   Any solutions?   Any ideas?
73,
Ed - ad7gr