Could you please check the screen shot please? Currently I am mining sumo on sumo.fairpool.xyz using version 1.5.0.
On my high hashrate rig, it is quite often to get million difficulty as shown in the screen shot below.
I tried with other miner as well like cast xmr 1.0.0, no issue with difficulty. Unfortunately, I didn't happy with it's hashrate.
And when the miner gets million difficulty, the miner will just display the hashrate, and few minutes later, it will run hashing again with difficulty 2000.
i hear you but the pool sets the diff, according to the speed you send shares. The more shares you send in shorter time so will the pool raise the difficulty. If the pool is set up good it should set a diff high so you should get approx 10 shares / min.
Others also complained on fairpool, but they said they have problems with every miner there, not only SRB.