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Rig with 5 rx 5700 xt with settings vram clock speed 1800 to 1810, core 1300 to 1350 MHz and voltage 725 to 800 mv , win 10, amd driver ver 20.4.2. Test it at f2pool, ethermine and nicehase. With teamredminer had no problem at all, no problem at all for 5 days continuously. With phoenix miner 5.4c and 5.3b I had the same problem, when the phoenix was starting after a while (from 1 or 2 min to few hours) 1 or 2 gpus they showed 0 mh while the phoenix continued mining with the other gpus without any message and the volt from the gpu that shows 0 Mh drops to 20 watt at the software and about –100 from the wall.
Any idea why it does this and how I can fix it?

yes I have an idea how you can fix it - stick with your teamredminer - continuously.

The thing is that with the same settings and the same watts from the wall, the phoenix has 55.5 mh on each card and the teamred has 54 to 54.3. I have seen that what the miners report in software is also reported in the pools. 1 to 1.5 mh per cart per day for 5 gpu may not say much, but over time it is a significant difference. So if I manage to stabilize phoenix it would be good. Of course I will prefer stability from the few mh above.
So anyone some idea?

Don't use cvddc, cclock and mvddc. Set it to 0 for each card and use only mclock and powlim. If you use msi ab use it only for fan control.

-cclock 0,0,0,0,0
-cvddc 0,0,0,0,0
-mclock 1800,1800,1800,1800,1800
-mvddc 0,0,0,0,0
-powlim -40,-40,-40,-40,-40 (some gpu can work with -45 or -50 but some gpu can't work even wit -40)

Thanks for the reply.
I do not use any of them in the bat file. For gpu control I use only AMD software. In the bat file I have only the main points such as pool, wallet and worker. The power limit of all gpus is at 0%. Should I add clock, cvddc and mvddc at bat file with 0?

set all to default in amd software and add settings in bat file, maybe amd software cause problems.
PM5.3b and 20.4.2 drivers should work fine.
if it doesn't work use trm or lolminer.