The issue Going into standby and waking up sometimes resets the "DRAM Channel A/B Voltage" to the default of ~1.2V. The bug in action: (Sorry about that shoddy camera work) How to reproduce Go in BIOS and set some non-default "DRAM Channel A/B Voltage", such as 1.3V. Boot and open some voltage monitoring software like HWinfo to check DRAM voltage and confirm RAM voltage is around the one you set go into standby aka sleep wake up check DRAM voltage (if it didn't reset to ~1.2V, repeat steps 3 to 5, may take dozens of attempts) The voltage stays at 1.2V even if you reboot. Only saving (unchanged) BIOS settings again fixes it temporarily BIOS versions tested F4g, F4 and the latest F5 BIOS are all affected. Previous BIOS versions untested. I already contacted Gigabyte support but no helpful responses just yet, only the usual troubleshooting (reflash BIOS, use our bloatware to check voltage, etc.). In case you are sporting a AM4 Gigabyte board with non standard memory voltage, would you please test it as well? Maybe you already experienced instability after waking up your PC before?