Since changing the mem speed to 2400, im seeing much longer periods before crashes. Around 8-10 hours:
M/B: ASUSTeK COMPUTER INC. ROG STRIX X370-F GAMING Version Rev X.0x - s/n: 180221242700511
BIOS: American Megatrends Inc. Version 5603. Dated: 07/28/2020
CPU: AMD Ryzen 7 3700X 8-Core @ 3600 MHz
Memory: 32 GiB DDR4 (max. installable capacity 128 GiB)
Corsair CMK32GX4M2B3200C16, 16 GiB DDR4 @ 2400 MT/s
Corsair CMK32GX4M2B3200C16, 16 GiB DDR4 @ 2400 MT/s