Has anyone experienced hashrate drop in what seems to be a quite consistent matter?
I'm not talking about my rock solid RX570 rigs, they've been absolute beasts for a year now. But I'm struggling with the Vega rig.

All GPUs will hash at ~41MH/s until one decides to drop to 26 for a minute. Then goes back up to 41. This happens regularly.

Surely if it were temp throttling (which seems unlikely as I have the fans running at pretty much 100%) the hashrate reduction would be more gradual... and not bam!... down to 26?

Any clues? I'm on v11.4, latest Adrenalin, Vega56@64, safe softPP table with specific clocks and voltages set in Claymore miner.