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However, blockchain syncing for my nodes stops at a specific block (the same block across all the nodes) and does not get past this hurdle.
I can see the peers still being connected at this point, but syncing stops for all of the nodes at exactly the same block and point in time.
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Maybe there was simply no new block mined and the block where it stops is the last block?
Then the blockchain is stuck there until somebody mines the next block.