He's getting smashed easer than ever before and it's a sign of something seriously wrong with his liver and also possibly his brain as a lower tolerance with heavy exposure is the body reacting in a seriously bad fashion.
Back when I was at my worst and was drinking 1lt bottles in a few hours and then topping it up with beer you'd feel drunk as fuck the next day and if you drink ontop of that too often it causes nerological issues particularly with balance, and memory processing, Cobes is getting smashed with a already fucked up brain and poor diet and drug use to that so he's not recovering like he should - and that's what I am seeing here he's started to enter a Terminal phase of alcoholisim that he needs serious help for or he's going to hit the rock bottom and might not be able to be scraped up off the floor when he lands no matter how hard Clint tries.