Sorry for late reply.
I know the system needs to be warmed up to perform at it's best, as I can clearly hear a smaller soundstage and dynamics, confirmed by a friend with full Accuphase set up. He noticed the volume was louder, which I have not noticed, as I always leave it to run at least 4 tracks before I rerurn to listen. However, we did not measure it with any equipment, but I need 6 clicks on the remote to bring it back. Two days he visited and same results. He commented that the soundstage and dynamics are far better after it had warmed up.
I now becomes aware of the volume and had checked with my phone on db and it shows a difference of 2 to 3 db on average.
Well, phone apps are not accurate, I agree, but it is consistent every time I checked. For the records, the ambient temperature now is 16°C. I will have to wait a couple of months for the temp to rise and see if its still the same. Just checking here if any users have such characteristics.