A lot of hot AIR from Devialet?

[hk6230]

Interesting that you get fewer problems and unplug your amps. As a matter of course I switch everything in the house off at the mains every night, and don't switch on until I am going to listen. I have not had white noise ever and few dropouts.

The white noise problem was first reported by Windows users and it was a considerable time before a Mac user reported it. I thought it must have been due to an Apple software change at the time. 
Because of previous experience with software updates needing early debugging has not been favourable I don't update immediately, and in the case of my music iMac I am still on Mavericks.

Interestingly, I also switch off my amp regularly (almost daily) and have no problems with AIR. 

This is almost certainly a contributory factor but not prime. My amps were off (at the mains) for days, and before repowering I took the PS Adio PPPs out. Result: No white noise for just about the whole day. So much so that I thought the PPPs had been the cause (rather illogical I admit).

White noise re-emerged eventually. The contribution to minimal noise was the prolonged powering down, not the PPPs.

My analogy is a bath which fills up (faster with hi-res) and overflows ( = noise ). (And probably takes a long time to empty entirely.) Stop the music and start a minute later using 16/44.1 and there is no noise for quite a while. Start using hi-res and it is back quickly.

In my short period of use I have started to think maybe the heat off the 200 may contribute in some way as the longer it is on the hotter it gets, and the white noise is never immediate. Its always at least an hour or two into listening. Wondering if some feet to raise the Devialet a little more off the rack could help........or maybe I am clutching

I agreed with Ian. It's very likely to do with the buffering. I'm almost certain that white noises/dropouts appeared when I played 24-bits files, which required more data buffering. For 16/44.1 files, I will only experience dropout once in a while, but always recoverable. Yesterday, I had an experience where only one particular music file is causing white noises. From the same music app, playing all other songs, there is no issue, only that particular song.