Songs streamed from PC to 360 playing at fraction their normal speed

Well changing the metadata does help but of course the problem does seem to move to other songs... Atleast I have a workaround for now. Thank you @Mephiles2 for the "workaround".

Well then, let's see if we can make this simpler. I don't think that the switch will cause any problems, but are we able to move things around a bit to get the Xbox and the PC connected directly to the ADSL2+ gateway? Switches can sometimes cause degradation
in the signal, though it does seem far fetched that it would cause it only on a select number of songs. I'm only asking this just to make sure we rule out everything and make it simpler for the Xbox, which really is just a simple machine. Switches can confuse
the poor thing.

Regarding your gateway, can you make sure that you have the most up to date firmware on it, too? This will ensure that we aren't running into a firmware issue inside the device.

Level: Error

Event ID: 405

It's worth mentioning all the music with the problem is on the Windows 8 pc without Media Center, and the reason I need the music playable on the system music player is so it can be heard during gameplay.

Oh man, Mephiles2! Sorry we couldn't get it completely figured out, but I am happy to see a workaround that seems to work for you. If you do run into any other issues, please post back up and we'll see if we can get you sorted for those ones!

Ok so after two weeks I decided to come back and try to solve this, but I ended up just replacing the problem songs with the originals from various sources (download, conversion, etc.). In this time, while browsing through one of the albums on the Xbox that
I knew housed slow-mo songs, I discovered that a handful of other previously unscathed tracks had also gone bad. I then marked them and replaced those as well. That being said this issue certainly looks like something that could keep growing into a never ending
patch job. For all I know the cause could be something as insignificant as the same song being played, or otherwise accessed on the computer and Xbox at once.

Afterwards most of the replacement songs actually held together, with the exception of one or two which were too stubborn to play normally. With these it took a bit of title juggling/changing between each song and the one I was trying to replace it with,
but they too were eventually amended. For one of the songs it was actually the 'slow' version that went back to normal after changing the title back and forth by a few characters, similar to the situation I described in the first post.

With still no probable cause identified, this problem is just as unpreventable as when it started. The only precaution I can think of taking is trying not to tamper with/reorganize the files within the music folder my Xboxes watch while any of the family
are playing the music through one of the consoles. I'll now leave it to someone else to try and resolve this mess.