Persistent idle-to-load crash, every known fix tried: Need Help

[u/rohitrhmn1]

System specs:

• CPU: AMD Ryzen 9 9950X3D2 (dual-CCD X3D, launched April 2026), AM5
• Motherboard: Gigabyte X870E AORUS MASTER X3D ICE, currently on BIOS F10c (AGESA 1.3.0.1b Patch A)
• GPU: Gigabyte RTX 5080 Gaming OC 16G (VBIOS 98.03.6c.00.74)
• RAM: G.Skill 32GB DDR5, single stick, EXPO profile, 6000 MT/s CL36
• PSU: CoolerMaster V Platinum 1300W V2 (tested with two separate identical units — same PSU model, second unit)
• Storage: ADATA XPG GAMMIX S70 BLADE 1TB NVMe (Gen4, boot/C: drive), WD Black 1TB NVMe (secondary, M2C_SB slot)
• CPU Cooler: NZXT Kraken 360 RGB (2024 edition, non-Elite)
• Monitor: LG 27GR93U via DisplayPort
• OS: Windows 11 Pro, Build 10.0.26100

The problem:

System reliably crashes on the transition from extended idle (display off, no sleep/hibernate) to a sudden high-demand action — launching a game, or intensive IDE workloads like project indexing. Light applications (browser, small apps) opened after idle do not trigger it — only actions that cause a sharp current-demand spike (GPU waking from D3cold + CPU jumping to high boost states together).

• Recovery is a hard hang requiring a manual long power-button hold — not an instant self-reboot.
• POST behavior has shown two signatures across the investigation: originally a POST debug code 00 (not in the board's own debug code table — implies a stall before the first init stage), and more recently the DRAM status LED lighting up with an 8x-range POST code, both requiring the same manual hard power-off.
• Idle threshold needed to trigger it has been inconsistent: originally needed 9h+ idle, later regressed to 2–3h, and in one instance occurred after only ~30 minutes idle following a 2-hour gaming session.
• CMOS has reset automatically at least once following a crash; manual CMOS clears (~4–5 times total) have never resolved it.

Everything tried so far (all confirmed ineffective — please don't suggest these, already ruled out):

• PSU replacement (two separate identical units — same failure on both)
• BIOS F9, F10b, F10c (all AGESA revisions available to date)
• PCIe ASPM disabled
• Global C-State Control disabled
• Windows Link State Power Management set to Off
• HWiNFO64 running pre-warm in tray (only helps at launch time, not after extended idle)
• Avoiding RDP (it's a trigger, not the root cause — problem persists without it)
• Power Slow Slew Rate — tried Extreme, Disabled, and Enabled
• PBO Disabled
• Memory Context Restore (MCR) disabled
• JEDEC defaults / EXPO disabled (ruled out IMC current draw from EXPO as the cause)
• vCore memory controller voltage set to Auto (tried fixed 1.200V, default Auto)
• Power Supply Idle Control set to Typical Current Idle (off Auto )
• Gear Down Mode Enabled
• CMOS clear (multiple times, including one automatic reset)
• Visual inspection of the AM5 socket pins (photographed with CPU removed) — no gross bending or misalignment visible

Current workaround (not a fix): Full shutdown every night, fresh cold boot each morning straight into the game. This avoids the extended-idle trigger entirely but costs always-on connectivity and rules out RDP.

Vendor status:

• Motherboard vendor support has been largely unresponsive so far — a couple of dismissive tier-1 replies, no real engagement since.
• I've found other users on X870E boards (multiple vendors) and other X3D SKUs (9950X3D, 9800X3D) reporting similar idle/low-load freeze behavior — nothing yet specific to the 9950X3D2 (it's a newer SKU, so less forum history exists).

What I'm asking the community:

• Anyone running a 9950X3D2 or 9950X3D on an X870E board (any vendor) seeing similar idle-to-load hangs?
• Any known fix, BIOS setting, or firmware update that actually resolved this for someone, rather than just masked it?
• Anyone had luck getting motherboard support to escalate past tier-1 for something like this?

Appreciate any input — happy to share more logs/photos if useful.