Purchased an unlocked Surface 3 LTE model (the 128GB/4GB version) last week from the Microsoft Store, and I have the same exact critical errors as Michael_A_P. However, the device does seem to eventually boot, which leads me to believe that the driver is
attempting to call for a resource/library during the initial boot process that hasn't yet loaded.
These errors only occur from a cold boot, not from sleep. I have hibernate disabled.
I haven't tried a reset or to load the BMR downloaded image (off-topic -- why doesn't Microsoft provided an updated build for these devices), but I suspect it would not fix the problem as it hasn't for other users.
I've tested the LTE modem with a T-Mobile SIM card and WiFi turned off and it seems to work, but haven't used it anywhere except at my house, so I can't repro the modem crashing during use. If it would be helpful, I can take it out for a quick drive around
town this week to see if I can get the modem to crash.
I am thinking about returning the device only because I don't want to wait until I'm out traveling to have the modem start crashing on me. The whole point of purchasing the LTE version was so I could use it when I was out without worrying about finding a
WiFi network. I'm also having tons of COM server timeouts for about a dozen different programs, which is unsettling.