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After 2 days off, my node is restarting this morning. I regurarly encounter such errors :

2019-05-23T07:08:10+02:00 - info: Block resolution: 1 potential blocks after current#222673...
2019-05-23T07:08:10+02:00 - info: Block #222674 added to the blockchain in 49 ms
2019-05-23T07:08:10+02:00 - info: Block resolution: 1 potential blocks after current#222674...
2019-05-23T07:08:10+02:00 - info: Block #222675 added to the blockchain in 41 ms
2019-05-23T07:08:10+02:00 - info: Block resolution: 1 potential blocks after current#222675...
2019-05-23T07:08:10+02:00 - info: Block #222676 added to the blockchain in 50 ms
2019-05-23T07:08:10+02:00 - info: Block resolution: 1 potential blocks after current#222676...
2019-05-23T07:08:10+02:00 - info: Block #222677 added to the blockchain in 43 ms
2019-05-23T07:08:10+02:00 - info: Block resolution: 0 potential blocks after current#222677...
2019-05-23T07:08:10+02:00 - warn: Proof-of-work self-submission: Cannot read property 'getRawSigned' of null
2019-05-23T07:08:10+02:00 - warn: Unknown reference block of peer

2019-05-23T07:08:38+02:00 - info: Block resolution: 1 potential blocks after current#222723...
2019-05-23T07:08:38+02:00 - info: Block #222724 added to the blockchain in 72 ms
2019-05-23T07:08:38+02:00 - info: Block resolution: 1 potential blocks after current#222724...
2019-05-23T07:08:38+02:00 - info: Block #222725 added to the blockchain in 63 ms
2019-05-23T07:08:38+02:00 - info: Block resolution: 1 potential blocks after current#222725...
2019-05-23T07:08:39+02:00 - info: Block #222726 added to the blockchain in 304 ms
2019-05-23T07:08:39+02:00 - info: Block resolution: 1 potential blocks after current#222726...
2019-05-23T07:08:39+02:00 - info: [5cnvo5bm] ⬇ PEER HT7cGFBN 222832-0
2019-05-23T07:08:40+02:00 - info: [5cnvo5bm] ⬇ PEER 47JpfrGk 222860-0
2019-05-23T07:08:40+02:00 - info: [5cnvo5bm] ⬇ PEER 47JpfrGk 222860-0
2019-05-23T07:08:44+02:00 - info: Block #222727 added to the blockchain in 4692 ms
2019-05-23T07:08:44+02:00 - info: Block resolution: 0 potential blocks after current#222727...
2019-05-23T07:08:44+02:00 - warn: Proof-of-work self-submission: Cannot read property 'getRawSigned' of null
2019-05-23T07:08:44+02:00 - warn: Unknown reference block of peer
2019-05-23T07:08:44+02:00 - warn: Unknown reference block of peer
2019-05-23T07:08:53+02:00 - warn: Identity with hash '2A3714384B159A13EF108D0041B4AA2C410230A70EA9B5149A038263FDE71AF2' not found
2019-05-23T07:08:55+02:00 - info: [5cnvo5bm] ⬇ PEER 2sZF6j2P 222832-0
2019-05-23T07:08:55+02:00 - info: [5cnvo5bm] ⬇ PEER 2sZF6j2P 222832-0

It does not seem to block the node, but it seems to slow down the join of the branch :

2019-05-23T07:10:16+02:00 - info: Block resolution: 0 potential blocks after current#222860...
2019-05-23T07:10:17+02:00 - info: [5cnvo5bm] ✔ PEER 82NdD9eE 222832-0
2019-05-23T07:10:17+02:00 - warn: Proof-of-work self-submission: Cannot read property 'getRawSigned' of null
2019-05-23T07:10:17+02:00 - info: [5cnvo5bm] ✔ PEER DsEx1pS3 222832-0
2019-05-23T07:10:17+02:00 - warn: Unknown reference block of peer
2019-05-23T07:10:18+02:00 - info: [5cnvo5bm] ✔ PEER 2cPRV3HV 222832-0
2019-05-23T07:10:27+02:00 - warn: Identity with hash 
2019-05-23T07:10:30+02:00 - warn: Identity with hash 'CCE876F02FF0F84762D079C87610CAF7C842F36F65FAEF9EF72716BA7E5E50FF' not found
2019-05-23T07:10:30+02:00 - warn: Identity with hash '7CBCE9741AA5AA4BFF2791703E4CD11C1B804CE5CC705A4606ED81BC88BF1256' not found
2019-05-23T07:10:31+02:00 - warn: Identity with hash '2CCC4EAD120E151F60AA941EBB5437BAC1D498B23052213F4799D602145842B1' not found
2019-05-23T07:10:32+02:00 - info: WS2P: Could not connect to peer 82NdD9eE using `WS2P 78.251.5.57 20900: WS2P connection timeout`
2019-05-23T07:10:32+02:00 - warn: WS2P request timeout
2019-05-23T07:10:32+02:00 - warn: WS2P request timeout
2019-05-23T07:10:32+02:00 - error: Unhandled rejection: WS2P connection timeout
2019-05-23T07:10:32+02:00 - error: WS2P connection timeout
2019-05-23T07:10:32+02:00 - info: Generating proof-of-work with 5 leading zeros followed by [0-7]... (CPU usage set to 10%) for block#222861 5cnvo5
2019-05-23T07:10:32+02:00 - info: SIDE Block #222861-0000008C added to the blockchain in 0 ms
2019-05-23T07:10:32+02:00 - info: [5cnvo5bm] ✔ PEER 4L6ki7UG 222832-0
2019-05-23T07:10:32+02:00 - info: Blocks were not applied.
2019-05-23T07:10:32+02:00 - info: [5cnvo5bm] ✔ PEER BftGs6Qk 222832-0
2019-05-23T07:10:32+02:00 - info: Block resolution: 1 potential blocks after current#222860...
2019-05-23T07:10:32+02:00 - info: Block #222861 added to the blockchain in 61 ms