Advice needed

Hy.
Help/advice needed.
My rig has 2x rx 5700 xt cards

  1. Sapphire rx5700xt nitro+
  2. Red devil rx5700xt
    Both with bios mod.
    Problem is that one card usually the sapphire card stops/drops out mining. And the miner reboots. This happens every 15min to one hour
    Same thing happens with teamred miner.
    Motherboard updated to latest bios Gigabyte z270 gaming k3
    8gb ddr4

Now intalled hive os beta 200909 and same things happen.
When I want to update amd drivers i get errors…