WOW, I’ve been experiencing this! I don’t feel so alone now 
This was one of my support issues and toward the end I had smoke pouring out of my lid and front door. I adjusted/aligned my exhaust several times and even completely moved the unit to a new location trying to rectify it and nothing helped. I took this video to show how much air was escaping. When I took apart the exhaust to prepare the unit for packaging a few days ago, I found the exhaust fan was very clogged. It even had little bits of burned masking stuck in it. Is it possible the pressure inside could get strong enough warp the lid at all? Mine developed a bow in the lid in the last few weeks that had not been there before. (Yes, it had a slight bow when it arrived, but this was a recent change to the lid.)
