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GPU frozen and cant wake up after sleep mode

Level 7
Hi, I'm struck with this unique problem. please help... My Radeon rx 6900 xt GPU is missing after i put my computer in sleep mode. It is happening randomly and very annoying. Asus Motherboard's white LED will be on if i try to wake computer from sleep. I have to hard reset the power/PSU to make the computer start again. Any help highly appreciated..

PC configuration -

Motherboard - asus rog strix b550-i
processor - AMD ryzen 9 5950x
GPU - AMD radeon rx 6900 xt
RAM - HyperX Fury Black 64GB 3600MHz DDR4 CL18 DIMM (Kit of 2)
SSD - Sabrent 4TB Rocket Q4 NVMe PCIe 4.0 M.2
water cooler - Corsair iCUE H100i RGB Pro XT, 240mm Radiator

Level 12
Are you running DDR4 kit @ 3600 correctly ?

So, you have set DOCP in the BIOS