Whenever DJs, especially morning and afternoon drive DJs, admit that they're just going through the motions on a particular day, I usually think, "It's best to give them grace, within reason. That's certainly appropriate when they're grappling with something tragic. Besides, no radio show can reasonably reach exactly the same heights during every edition."
When DJs phone in their performance routinely, however, for no apparent reason, I think, "Credit for honesty, but as my high school American Lit. teacher used to tell the class, 'You have to do the work. There's no substitute for doing the work.'"