RX Vega 64 randomly drops GPU & RAM clock

So, my recently purchased RX Vega 64 is randomly dropping GPU and RAM clocks, which causes stutters while gaming.

I have tried every possible solution described online, using Wattman and MSI Afterburner. Tired to down-clock and down-volt the GPU, still, the usage is 99%, the temps are <70C, and GPU suddenly clocks itself below 1000 MHz, while RAM drops too 100 MHz.

Any ideas what else to check?

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  1. The problem was with poorly applied thermal paste on the HBM memory modules, which lead to sudden temperature spikes up to 100C. The GPU temperature was okay, only HBM modules suffered.

    I had to re-apply the thermal paste (and loose the warranty) to solve the issue.

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