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I run a private chain with mulitpe Clique POA nodes for several days. Today I found the block can not update normally. The Geth version(executale version) info:

[root@localhost ~]# geth version
WARN [08-07|03:40:22.723] Sanitizing cache to Go's GC limits       provided=1024 updated=612
Geth
Version: 1.8.27-stable
Git Commit: 4bcc0a37ab70cb79b16893556cffdaad6974e7d8
Architecture: amd64
Protocol Versions: [63 62]
Network Id: 1
Go Version: go1.11.9
Operating System: linux
GOPATH=
GOROOT=/home/travis/.gimme/versions/go1.11.9.linux.amd64

One node(signer) of them keeps printing the info:

Regenerated local transaction journal    transactions=0 accounts=0

Another node(sync node) prints the info below:

ERROR[08-07|07:00:19.274] 
########## BAD BLOCK #########
Chain config: {ChainID: 12345 Homestead: 1 DAO: <nil> DAOSupport: false EIP150: 2 EIP155: 3 EIP158: 3 Byzantium: 4 Constantinople: 5  ConstantinopleFix: <nil> Engine: clique}

Number: 629002
Hash: 0xc19577b06e78b5d8d428c338cc04d94dffaf1086bc02c9bf9c14a6b51bcec2eb
         0: cumulative: 23192 gas: 23192 contract: 0x0000000000000000000000000000000000000000 status: 1 tx: 0xccfa3f42cb9cb13d2f4de5dec4806cb258f8929b342a72d823d0fcc6ccf047a2 logs: [] bloom: 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 state: 


Error: invalid merkle root (remote: b17031a61bfef3cf158589e72a8ea52b6e482af9d1e9420d99416dd8fa7a9267 local: 2e3c2ba5838a27d20bdd8aed88d57cc68afacdd2239a905a73ec9842b48da18c)
##############################

WARN [08-07|07:00:19.274] Synchronisation failed, dropping peer    peer=f7f59f3d3a7f1bc6 err="retrieved hash chain is invalid"

How to fix the problem? Many Thanks!

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