Can't say if its true for everyone but on my TB250 BTC PRO my windows boot time takes so long. I've already tried reinstalling windows and still the same problem.
I've learned to live with it and wait at least 5mins for my miner to boot to windows desktop. When it finally turns on tho, no problem. Running 6 AMD and 6 NVIDIA cards just fine.
Here too, every time the rig turns on for the first time it hangs and restarts + - two times, after that it stays stable for weeks, if I turn off the rig or restart
the problem comes back.
I already changed batteries, reset bios, nothing works.