Over night difficulty raised many times, reward dropped too. On
https://sumo.fairpool.xyz in the middle of the night (2am onwards) huge miners showed up. While total hashrate was around 15-19M, those who joined had 5Mh combined. The next morning I can't get 5 sumo of each Vega/day anymore. Now its literally 1 sumo/1kh/day or even slightly less. Good news for Sumo, bad news for small miners (like myself with 5 Vegas)
No worries, algo will align the diff as soon as they leave. And if they stay the price will raise so that you will make nice profit anyway.
SUMO is miner friendly, this is just a hiccup.