I have a core clock problem with an MSI Armor RX570 4GB (Hynix) card.
As you can see on the picture below, one of my card's OC is stable, but on the second one the core clock fall back after a few seconds of running..

Memory clock is stable on both cards. I tried Afterburner (4.4.0 Beta 16) and Claymore's OC settings but none of them works.
Did anyone face this problem before?
Thanks in advance,
zsugabubus007