I 've noticed mine better with more warm up. I believe it's a temperature issue. So it may depend on the ambient temperature in the room. I live in Seattle and our house is usually kept at a chilly 65 degrees.
I've had my Lyr for several years - so I've heard it in many seasons. I have logged thousands of hours on mine, rolling over 50 different tube types, both new production and vintage.
Oh, I see. Kinda makes more sense I guess. My room is usually about 70 degrees here so I guess my amp doesn't take long to fully warm up. I find it hot to the touch after about 45 minutes operating time. And good to know your Lyr has lasted you that long. :) Hoping these things are as reliable as Schiit says they are. I've only rolled one set of tubes so far but plan to do more in the future when I settle with my new current ones.