Sure, but how often does that really happen?
It happens all the time based on my own experience with the industrial strength system. Believe me, I deal with it every day, That is why we design a network with heartbeating going on, retrans at the app level in addition to the tcp networking model.
That’s why I’m asking you 
Shouldn’t this then by evident all the time, such as with people’s software downloads failing?
it can randomly happen with anyone, with any system, even with a low traffic like audio streaming. This is why some folks who have obsolete routers usually encounter the audio SQ issue.
I don’t doubt that I can happen randomly, I’ve seen the odd download fail over the past decades, but my question is how often does it really in practice
Honestly, impossible to tell.
OK, back at square one 
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Not sure if you are serious or not? But simplistically the vertical movement tracking the groove is one channel, and the lateral movement in the groove the other channel. 
I was serious, and I know that part, I still don’t really understand how it works. Based on just this vertical/horizontal thing, I would naively expect that the groove has a constant width and guides the stylus in 2 dimensions, but in fact when looking at a microscope picture of the groove, the width changes constantly, and I just don’t really get it
Well one axis is connected to one set inductive coils, to generate the signal for one channel, and the other axis set to another set of coils for the other channel.
Therefore if the groove had solid walls, but was modulating only up and down. Only the vertical axis coils would generate current… so sound would come out of one channel… and vica versa . With stereo content, there is a combination of vertical and lateral movement… and the stylus moves in a 3D space… you can see why the cartridge and arm are so important to recover this.
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Repeating my later edit from above:
* the third dimension coming from the rotation/time
Edit: To clarify, with “really understand” I mean that I should be able to conceptually draw how the groove should look for a simple case. E.g., a 500 Hz sinus tone in one channel and a 1 kHz tone in the other channel. But I can’t really, so this means that I don’t “really” understand
What I think is that the differences between online streaming and local streaming increases with a high quality server, as Melco, Innuos.
Michael b ( with Innuos Statement) , Gazza ( Melco N10), Dark Bear ( Melco N1z2) , Steve ( N10)……all found also that local files for the same album sound better. But that difference varies with some albums and is not always pronounced.
On Qobuz you can buy individual files, so a good test would be to compare a dozen hires files from different albums, bought on Qobuz, vs the same files streamed from Qobuz online.
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I deleted the Qobuz version from my Roon Library and then the higher resolution version showed up! Must be a little bug in the version feature.
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That would be the fourth dimension; ie time.
The grove and they stylus position is defined in three dimensions… (x,y,z) for a point of time.
Clearly the induction in the coils to create the stereo signals, requires a change in position of the stylus , ie motion or time. That is Fleming’s Right Hand Rule.
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Huh? The stylus can go left, right, up, down. That’s 2 dimensions as far as I can tell. It doesn’t go forward or backward (apart from small changes caused by its angle when moving left, right, up, down)
In any case, my failure to understand is not with this, nor with the coils picking up the field changes, but with the apparent changes in the width of the groove as well as the right- and left-hand sides of the groove in pictures showing different frequencies. Which in turn leads to my failure to draw what it should look like - note my above clarifications.
Yeah – you are right - the Z would be the rotation movement
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Presumably the groove becomes wider as it becomes deeper, as when the more-or-less V-shaped cutter makes a deeper cut it must also make a wider one?
That’s a good point, but unfortunately I expressed myself poorly
As far as I can tell, what you describe would lead to an uniformly wider-then-narrower-etc groove. Ok, I could get this. But I am struggling with pictures like this (and they all are this way):
The vibration on the left and on the right of the groove seems to differ. How can one side of the stylus vibrate differently from the other side?
What’s worrying for my mental health is that I still don’t get it even if I see it in motion 
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