TMD700 screen blank when powering up...


Recently my screen has been blank upon startup and slowly reappearing to pre-set brightness and contrast after 20 or so minutes. Functionality of the radio seems fine. Settings and environmental conditions are unchanged. Seems to be worsening though as it us taking longer to be visible especially if unused for a few days. Suggestions or time to move on to a different radio?
73 N6BLU