It’s the Bartok that locks up.
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This is definitely not normal behaviour. My Bartók is always on (display off), I only power it down when I am going to be away from home for more than a couple of days, but I have never experienced this sort of thing in the four-or-so years I have owned it.
Do you mean On as in ready to play, or in standby as per my attached photo?
I leave my Bartók in Standby 24/7 no problems. Wakes up and sleeps on command using Mosaic. Occasionally I used the front power button.
So this is how it was being left, 3-4 hours before locking up. Input is Network with nothing playing.
We’ll see how it goes. Perhaps Dunc and I could share a lift to Cambridge!
Not in Standby, just idle not playing anything.
No issues when it’s in Standby. Wakes and Sleeps via Mosaic or front button flawlessly.
No, I mean unit (fully) on with display and logo off.
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Thanks for confirming that Andrew.
Going to run a test tonight.
I have turned the Bartók on and turned the display and the logo off. I will check it in a couple hours, and see if it’s locked up. If not, I’ll leave it overnight.
Normally I’d never leave it like that, I’d always put it into Standby. I thought that’s what most of us did, but looking at the comments, some leave it on in an idle state.
No, don’t do that. You’re likely to catch some other disease that Dunc’s Upsampler has been experiencing…
Just kidding 
I think most of us do leave it on standby when not in use. My Bartok hasn’t been switched OFF in a very long time. It’s either fully on (with display on too) all day, and Standby at night, or occasionally fully switched on for days without being put on standby.
Ultimately, no matter what your usage pattern, it should not lock up. It needs to be serviced.
Anup is right. BTW you will not need a trip to the factory with or without Dunc. ( unless dCS ask you - which I would not expect). First step is to talk to your dealer.
Dunc’s direct contact was brought about as Phil ( then of dCS support) picked up on his issue here on the forum as he regularly posted. His replacement Tom does not appear to work in this way, at least so far.
As a general comment, a DAC is a specialised computer. As we all have probably experienced, our PC may occasionally behave strangely - like locking up. The help desk’s standard opening line will be " have you switched it off and back on again?". My ISP’s technical help line even has a pre-recorded message played before you are added to the queue asking this. Which is what you have done. The important difference with you is that the issue quickly reappears. So dealer next as a service has to be arranged through him.
Good morning Anup
That is how I leave mine. I used to turn off the display including the logo. However, I do think the unit looks a little bit ‘naked’ 
. So now I have it switched on, but just at 20%.
At night, I put it in to Standby so that the Bartók’s little blue light shows.
Sometimes there is confusion, between ‘leaving it on’ (Receiving a signal and ready to play) and ‘Standby’ (No signal and needs waking up)
I ran a test last night…Left the Bartók on from about 20:00 until 08:00 this morning. No naughty lock ups and responded to commands from Mosaic.
I’m sure it wouldn’t make any difference, but I left it on AES1 with no signal, not NETWORK and with the display switched off. 
I was just kidding Pete…
I am in contact with Support via PM, so I’ll see what they suggest first.
Please see my Update from last night
UPDATE
I left the Bartók fully on (Not Standby) from 20:00 until 08:00 this morning. It responded to commands via Mosaic and from the buttons on the unit. Zero lock ups.
I left the Input as AES1 (With no signal), Not Network as previously and the display and logo turned off. (Not that the display status would affect it)
I have done. I think that you are trying any combination of usage regimes in the hope that you will magically land on a solution. Leaving it off or in sleep mode won’t have anything to do with the issue nor will the selection of input IMO. The history so far indicates that it will lock up again at some point shortly. It needs to be seen by a support specialist.
As you have a PM dialogue tin progress hen see what they say. However, a hierarchy for servicing exists with dCS and this commences with the dealer. I expect that the outcome of your PM may well be “contact your dealer”. 
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Thanks Pete…I have contacted the same dealer before about another product.
I was interested to see that 3 other members have the same issue, but as you say, I’ll see what support suggests.
Not only that, I’ve unplugged it from the wall.
David, magical thinking again.
When Bartok or other dCS DAC is switched off fully (back rocker switch) the operating firmware is refreshed from memory when it is switched back on. At least that is what they told me back in time ( Elgar?). I expect that this aspect may be the same with current units. Of course if the firmware held in memory is corrupt then the fault will reappear. Your issue? No idea. it needs an expert.
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