I got a strange problem and am not sure if anyone here has the same issue.
My rig is running win10 with phoneix5.6d. Since I only mine 12 hrs a day to avoid peak time electric fees, it is auto turn on and off every day. The miner is autorun using the task scheduler after the rig is on. It has 10 gpus (6*rx580 + 4*gtx1070) so can generate around 300mhs. However, I have noted that when the rig is auto on and run the miner, it only got around 292mhs. I have to manually close the miner and run it again to get 300mhs, otherwise, it will stay around 289~292. I also found that the report hashrates in bitfly is unsteady when it's around 289~292. if I restart the miner (not rig), the report hashrates will be steadily staying at 300mhs
For me, it sounds like the miner needs to be "warm up"?? anyone here got the same problem?? Btw, I remember I don't have this problem when using claymore.
Maybe it's because of really high heat of this summer because my cards (from Sapphire) automatically reduce their power when temperature are really high to prevent damage to the cards.
I used to get 31.5MH for each of my RX580 cards in spring and winter but now I have 29MH at most of the time and 26MH for some really really hot days but when I manually restart PhoenixMiner each time I get 31.5MH at first 5 minutes then it's changing itself to that protected state again.
I like this feature though I don't know it's Phoenix doing it or my Sapphire cards but I like it that my cards can protect themselves from really high temperatures and I think that 4-5MH is not worth breaking card in this really hot summer.