Hello. I have been using the rx 5700 sapphire pulse for a year now and have had the same problem with frequencies and voltage during this year. The card behaves extremely unstable at its factory frequencies, and I reduce them. If you put the PC in sleep mode, then when you wake up the settings will not be erased, but if this is a reboot or shutdown, then adrenaline rolls back my config to the factory one (and even the speed of the coolers on the video card) The whole problem is, as already mentioned - the card is unstable, and after entering any game, after 5 minutes there will be a guaranteed black screen, unpleasant sticking sound, and restarting the PC (without my intervention) Please help if you know how to fix these rollbacks - tell us about them.
I have already delved into the power supply settings of Windows, I have repeatedly reinstalled Windows, it is also worth remembering to update the drivers for this card. I also download them, and I willingly believe that the problems will disappear, but this does not happen