Hard to dig through these threads... I had this problem early-on with my iX50. The dealership suggested I do a system re-boot which fixed the problem. Turn on the ignition (doesn't need to be "drive ready") then push down on the center console volume control knob. Hold it down for 45-60 seconds. The dash goes black. Then start the car as you normally would. I think of it like a "control, alt, delete" move on older computers. I've since had to re-boot 4-5 times. Annoying but hardly catastrophic. I think we should give BMW some slack on this as it's the software bits that are hanging up rather than the mechanical bits. They have to start somewhere!
By no means, I'm BMW fan-boy, had a M2, 3 series, X3 and now with an IX M60 and X7 M50i. Those gas cars didn't have any issues whatsoever other than just regular maintenance. But the IX so far already had a few software issues but was able to "fixed" by updates. However, I don't think these Drivetrain and High-Voltage warnings are simply software issues.
Since the dealership is closed for the holidays and couldn't get in touch with them to discuss these Drivetrain and High Voltage Battery Warnings issue. A friend of mine (he owns a local auto mechanic shop) has a diagnostic tool that he can run a scan of the M60 for me. He is not an EV technician but very knowledgeable.
There are 4 fault codes that are permanent and 2 in which are drivetrain related faults. In my case, he suggested that it is not just simply some "software issues/bugs". When faults are detected by the modules and permanent, there must be something wrong.
Control Module:
EME2 (Electrical Machine Electronics 2)
Fault Codes:
224F90 Function: Service Requirements Immediately (Permanent)
0317F1 High-Voltage System, Insulation Fault Detected: When Switch Contactors Are Closed (Permanent)
He noticed the fault 0317F1 could be possible moisture detected in one of the plug connections of the High-Voltage cables to the motors but not 100% sure. He said that the fault might/would/should eventually goes away once the moisture is no longer detected or to an acceptable level. Let the car sits for days and let the moisture evaporate. Just to be safe, I'll let BMW take a look at it and let them figure it out.
We did get alot of snow and rain in my area recently and most of the drive time was in snowy and rainy conditions before the faults were triggered. Service appointment is booked online, hopefully it is nothing major.