Is it a coincidence that the sudden drop coincided with the arrival of Treliving? Weren't there some "talks" about something being off within their relationship towards the end of his last contract in Calgary. If I remember correctly his ToI and usage was dropping quite a bit last 2 years of that contract before Treliving let him walk.
If nothing else ( and even if there's no meat to the rumors back then ), shows how little he was trusted then. Fast forward to today and those insecurities may have reared their ugly heads again. Coupled with extra wear & tear, age, body wearing down and if he's now 2nd guessing everything and feeling the possible "distrust", no wonder the decision making is often off ... or at best slow.