Stop code: DPC_WATCHDOG_VIOLATION

I am having the exact same problem, have not found a fix. I just got my tmobile 2 weeks ago.

A common source of this problem, if it happens when connecting to the network, is that there is a problem with your network card driver. Updating the driver or uninstalling/reinstalling it may fix the problem.  I haven’t had the problem, but my Windows laptop is an HP with an Intel® AX211 wireless card in it.  If I had the problem, I’d first try installing the latest HP driver for it, and if that didn’t help, I’d try getting the driver from Intel. If the problem persisted, I’d use an Ethernet connection, but I’d check out the Wi-Fi periodically after Windows updates, and I’d also check periodically for updated network card drivers. Good luck.

I'm having the same issues.  Sometimes it works and other times it shuts down my PC.  It has been working fine and then today I had to reset my router because there was no Internet.  After doing that, the doc watchdog violation started again and now I'm in the endless loop of the computer restarting.  

Hey T-Mobile...any ideas why your product doesn't work with Microsoft?  It would be nice to pay for a product that actually worked for me.

I have been having the same issue and I've tried 8 different network adapters including: 2 Asus, 3 internet cheapies, 1 Netgear, and 2 linksys.  I would like T-Mobile to tell me which adapter will actually work.  I'm in a place that has zero options, so i have connected only one of my computers via Ethernet cable.  Not what i thought i was getting.  Until this gets resolved i would recommend people stay away from this product.