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I had a problem that my blockNumber gets stuck. Then I ran geth upgradedb and started geth --rpc --mine console again.
It looked like it was working, had the correct blockNumber for around 30 minutes and had net.peerCount = 1.
And now again, net.peerCount = 0, the blockNumber has stopped updating and it doesn't get synced...
Check this similar question and answer that might give you some hints on how to proceed.
