Rx5700 and Rx 6700 not working on my rig

Hi to all.
On my rig I have some RTX 3090 and Rx 5700 and that working perfectly.
Not long ago I added another rx5700 and my miner decided to go on holiday. It’s going offline.
I removed Rx 5700 and everything back to normal.
2 days ago I added new Rx 6700 and boom again. Miner is offline.
Help me plz