I am solo mining and getting some or nothing last 2-3 days.
Looks like diff increased a lot? Block explorer does not say so.
150Tb cluster
Are you BURST-94CV-7DGV-CTHZ-EQ7N8 ? The graph looks pretty normal to me.
Well, could be sheer luck or the absence thereof, you just have a statistical chance, no entitlement of finding a block.
What miner engine are you using ? I've had problems with the original java miner, but that was solved by restarting all instances daily. No error on "misbehaving" miners was given, I had to try a few things to find that.
Also, they don't like running in tight memory conditions, the amount of memory you need to provide seems to be directly related to the stagger in plot files. equal plots sizes with 16k and 360k stagger use 24gb vs. 8 gb on my system, IIRC - ditched all small files weeks ago.
My wallet feeding 8 instances its pretty stable, though.