Ok lets start from a beginning.
Clocks. 1530@1050V and 1100@1050. Works great on CNv8 with 15+14. 2050h/s. Cards are on water.
On the same clocks on CNR and those crashes. On 13+12 works with bad hashrate reporting. At that settings and 18.6.1 driver I have 36*C on the core and 155W of power.
I also use this miner for Lyra2rev3 with 108Mh/s per cards with no problem for weeks.
So NO, this is not the problem with voltage/clocks setting.
Every algo creates a different load signature, which can require different clock/voltage settings. Just because some combo of settings worked for some other algo, doesn't mean it will work here. Though it does appear the settings should be close to cnv2.
What about the bad hashrate rapport? This is voltage/clocks setting issue to?
Absolutely - I've seen the same behavior, in many different miners, for many different algos. Just now, in linux, I experienced a 2700H/s report from TRM stemming from a too extreme uv.