In the first hours there is a lot of messages
I0513 07:57:48.196669 43876 worker.go:355] commit new work on block 318750 with 0 txs & 0 uncles
Then later a lot of
05:52:32.205026 43497 sync.go:103] Synchronisation failed: pending items in queue
05:53:41.530992 43497 chain_manager.go:580] Split detected. New head #317650
(bcfa5bb8) TD=25077608748681, was #317649
I0513 05:53:41.531775 43497 chain_manager.go:628] imported 2 block(s) (0 queued 0 ignored) in 18.225987ms. #317650
[67e7c1a2 / bcfa5bb8]
I0513 05:53:46.113598 43497 chain_manager.go:580] Split detected. New head #317650
(39affb88) TD=25077609388765, was #317650
I0513 05:53:46.114115 43497 chain_manager.go:628] imported 1 block(s) (0 queued 0 ignored) in 5.071608ms. #317650
[39affb88 / 39affb88]
When geth is restarted it again starts mining for a few hours. Then same thing happens.
I am behind NAT with 2 miners. This happens on both. Using different listening ports on both.
I am willing to help to debug this issue, so any developers are welcome with comments or suggestions what to look for.