Seems situation is normalized again.
At least all three of my nodes are synchronized, the blocks are coming up correctly and I can mine again.
But it's very bad that more than 50% of the network is in the hands of one miner and it can generate 5 blocks in less than a minute.
It's not just bad, it's terrible

. Makes the whole of point mining this coin worthless.
yes,very agree,it make whole of bismuth worthless.
I have told the dev about this, dev needs to solve this terrible problem.