AM hashrate is back up. It seems to be the all time high, around 80TH/s.
this is called luck and variance
Often, some noobs under-estimate the effect of variance, and get crazy every 6 hours "it's up!", "it's down!".
But this time, I fully agree. This is not variance. They were undoubtedly having a low hashrate these last days, around 30TH/s, and they are now way higher. The possible range of this "way higher" is still large given that the increase is recent, but it will shrink over time and we should get a reasonable approximation in 48h. Personally, I think we will be higher than the previous high of ~60TH/s. I expect 80 or higher.
My hypothesis is that the recent low was due to some work required to extend the farm. Now the extension is being turned on... Welcome the new hash rate!