I have a good friend who has a similar drinking habit. He doesn't crave alcohol or drink often, but when he does, its like he's drinking energy drink, not alcohol. He just keeps going until there is so much alcohol in his system he shuts down. That can take 7-8 HOURS. I would say that based on your description of consequences you suffer when you do drink, that quitting would be a prudent decision. Wish you the best.