I used to have my f4-3200c14d-32gtz (G.skill Trident Z 2x16GB 3200MHz) RAM working at XMP settings stably on both 2.40 and 3.00 on my X370 Taichi. Unfortunately, it suddenly stopped working after cold boots a few days ago. Basically if I OC and warm boot, it will run fine; but as soon as I cold boot, it will go into this loop of restarting less and less abruptly and after maybe 7 reboots it will boot at stock settings. I tried lowering the frequency: 3066 MHz will have the same issues; 2933 works. I also tried raising SOC voltage to 1.15V and DDR voltage to 1.40V but neither helped. I also tried all configurations of stock/OC CPU and RAM, and basically, it will happen independently of the CPU OC. What confuses me is that it worked fine for a few days on 2.40 and 3.00 and broke a couple days after the 3.00 update. Is there any way of touching the boot DDR voltage on the Taichi ? Seems to me like it would solve the issue seeing as it's one of the rare things I can see justifying why warm booting works fine but not cold booting. Note that I basically did not touch the hardware at all since setting up this computer, so I'm not sure reseating the DIMM would help. Or is this something else entirely ? Thanks for your help.

PS: I'd have trouble seeing how moving the RAM to A1+B1 will help seeing as it worked for a bit in A2+B2, unless 1.0.0.6a broke something (and the truth is, I'm reticent to move RAM to A1 given that I'm using a Noctua D15 so I simply wouldn't have clearance to have the second fan, and my temps are already pretty hot compared to some at 72C under OCCT Linpack or Prime95 at 3.8GHz@1.3V). 

PPS: The advanced training thingy is disabled, and I tried disabling fast startup in Windows but it didn't help.