Thank you, Dave for your referral to this thread and I am looking forward to the fix. It is not a deal breaker, but super annoying that I cannot rely on the machine to be hot after turning it on. Luckily, I got a group head thermometer, so i can handle it a little bit better.
I was the Reddit guy who suggested removing the o-ring on the reservoir, as the dealer suggested to me and was also instructed on an extra sheet inside the packaging. This was the only thing that popped into my mind. I guess, they also forgot to drill a vent hole into the lid.
I am curious in which direction your suggested mod goes. :) The only thing I could think of would be some direct plumbing, or using longer hoses to move the reservoir underneath the counter.