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Here you go I use mine with the Surface Pro 3 dock not the newer one. It does not drain unless you are gaming since the SP3 dock charger is only 50 watts. When gaming, the SP consumes a bit more than that.

Don't use best performance all the time. Just stick with recommended power savings to save power during idle

If you can run prime 95 torture test on 1 thread to see if voltages does spike to 1.3+

Yep. Those peaks are about a millisecond long right? Anyways, I believe it's still a firmware issue where if all of the power savings are unlocked the UEFI/BIOS have a tendency to overclock it to its limits for a single millisecond. As long as the sustained load is at 1.15 to 1.2 volts at...

Sustained load is what matters. 1.239 peak max and 1.15% load is 100% OK to me. BTW, even gaming doesn't subject the CPU to extreme test like XTU or IPDT so you're perfectly fine.

^ A good voltage would be about 1.15 volts maximum sustained and about 1.2 volts peak IMO. You can check out some of the voltages here: Top 15 Highest frequencies for Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz - CPU-Z VALIDATOR

^ Do voltages stay at that point for a while. I'd worry if that is sustained voltage though since it's still high. Normally, @ 1.351 V, a good overclocking i7 desktop chip would've hit at least 5 GHz. No reason for a 3.8 - 4 GHz overclock to reach 1.351 volts

@LTwin First the CPU multiplier is locked and I don't thin you can overclock the BLCK to something over 100mhz since it won't post beyond that anyway

Firmware updates would sort it out. It's probably a driver not waking up and has thrown a stop code

Did you set the power plan to best performance? This keeps the CPU frequency at max turbo which is 4-4.2 GHz for the 8650u chip

I like the program that they use (TS Bench from Throttlestop). I had to try it to my Surface Pro and was impressed that it literally maintained 25 watts (3.7-3.8 GHz on both cores @ 100% load) for the whole 1024 computation which took 455 seconds. If Surface Pro can maintain a 25 watt below 95...

Just use Windows update or upgrade to 1709 if not yet updated

Hopefully, not all SB2 units are like that. At least with Surface Pro I still have 35 degrees left before it fails, and yes I've run it twice consecutively.

Surface Systems Aggregator is part of Surface Firmware. I'd update the firmware to the latest if it's not updated

Crazy voltages there. As for OP, definitely exchange his unit. The i7 in my Surface Pro only goes up to 1.2 V at 4.0 GHz

Sounds like the thermal isn't working like it should. I'd run Cinebench on it for 3x and see if it throttles. If it is, I'd try to bring a USB drive with Cinebench on it, go to the nearest MS store and try running Cinebench there to check if it's just your computer or all SB 2 are affected.

The OP has not updated his Windows to 1709 version. There's really no way to avoid fan ramping up on gaming unless throttlestop program works to limit the CPU frequency to 1.5 GHz or less when gaming.

Playing a game makes the CPU work near its max so it's supposed to heat up and the fans are supposed to keep it from melting the chassis. Maybe you can use a USB fan to keep the back cooler.

Check if you recently unchecked "Allow Windows to turn off this device to save power". This must be checked for proper Bluetooth operation after aeroplane mode

If your car has AC 120V or 230V, you can use the surface charger.