Perhaps I'm not so familiar with Feature 145 after all. I thought you were referring to a Feature map number.
Since this is a new decoder:
1/ What would cause the CV 53.1.1 = 143 (shutdown) instead of 145 (Disconnect/Standby/Shutdown)? I certainly did not program CV 53.1.1. Is that some kind of Function button 9 default?
2/ Does double pressing Function button 9 (at idle) actually Program On the Main - Changing CV 53.1.1 = 145 to CV53.1.1 = 143 ?
