ERROR rpc [email protected]/websocket.go:121 handle me:write tcp

[btcioner]

Describe the bug
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To Reproduce
When finish 2020-08-22T07:32:29.906 INFO filecoin_proofs::api::seal > verify_seal:finish
2020-08-22T07:32:29.906 INFO filecoin_proofs::api::seal > seal_commit_phase2:finish
2020-08-22T07:32:29.906 INFO filcrypto::proofs::api > seal_commit_phase2: finish

1. Run '...'
2. See error

ERROR	rpc	[email protected]/websocket.go:121	handle me:write tcp 192.168.80.27:2345->192.168.80.14:41912: write: connection reset by peer


2020-08-22T07:41:02.756Z	ERROR	rpc	[email protected]/websocket.go:646	Connection timeout	{"remote": "192.168.80.47:2345"}
2020-08-22T07:41:02.756Z	ERROR	rpc	[email protected]/websocket.go:495	sending ping message: write tcp 192.168.80.14:48324->192.168.80.47:2345: use of closed network connection
2020-08-22T07:41:02.756Z	WARN	advmgr	sector-storage/sched.go:463	Worker closing	{"workerid": 15}
2020-08-22T07:41:02.756Z	WARN	advmgr	sector-storage/sched_watch.go:89	worker 15 dropped
2020-08-22T07:41:02.756Z	DEBUG	advmgr	sector-storage/sched.go:660	dropWorker 15
2020-08-22T07:41:02.756Z	WARN	sectors	storage-sealing/fsm.go:401	sector 175 got error event sealing.SectorSealPreCommit2Failed: seal pre commit(2) failed: RPC client error: sendRequest failed: websocket routine exiting

020-08-22T07:32:29.906 INFO filecoin_proofs::api::seal > verify_seal:finish
2020-08-22T07:32:29.906 INFO filecoin_proofs::api::seal > seal_commit_phase2:finish
2020-08-22T07:32:29.906 INFO filcrypto::proofs::api > seal_commit_phase2: finish
2020-08-22T07:32:29.907Z	ERROR	rpc	[email protected]/websocket.go:121	handle me:write tcp 192.168.80.18:2345->192.168.80.14:38054: i/o timeout

Expected behavior
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Version (run lotus version):
Daemon: 0.4.6+git.5c6b99c9+api0.11.0
Local: lotus-miner version 0.4.6+git.5c6b99c9

Additional context
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