Issue with pc posting

Every now and then I have an issue where my pc doesn't post and the power light flashes read. It's always sorted by taking out my second stick of ram, loading into bios, removing DOCP and reverting to normal, rebooting and then I can shut down, install the second stick of ram again and apply the DOCP and it works fine for however long it decides until it does it again.

My question, is this an issue with my second stick of ram, the mobo or a CPU issue?

Specs are: Case - thermaltake t500 air

Mobo - Asus prime b650 plus

CPU - AMD Ryzen 7700x

Ram - Corsair vengeance ddr5 6000mhz

GPU - rtx 4090

TIA