Why dashnode or insight sometimes is down

[Skrutch]

Hello all, please help me 1 month more can't correctly up Dash node.

OS: Debian 9.3 (x86_64)
Install step-by-step https://dashpay.atlassian.net/wiki/spaces/DOC/pages/86278560/Installation+Configuration

root@servanthost:~/.bitcore/data# netstat -tunlpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:9999            0.0.0.0:*               LISTEN      3536/dashd
tcp        0      0 127.0.0.1:28332         0.0.0.0:*               LISTEN      3536/dashd
tcp6       0      0 :::9998                 :::*                    LISTEN      3536/dashd
tcp6       0      0 :::9999                 :::*                    LISTEN      3536/dashd
tcp6       0      0 :::3001                 :::*                    LISTEN      3523/bitcore
tcp6       0      0 :::2468                 :::*                    LISTEN      622/sshd

Here I see 9999 is Dashnode port and 9998 I think is RPC port, everythink is ok?

Unit process debug

More than one instance of bitcore-lib found. Please make sure that you are not mixing instances of classes of the different versions of bitcore.
More than one instance of bitcore-lib found. Please make sure that you are not mixing instances of classes of the different versions of bitcore.
[2018-01-14T15:25:25.228Z] warn: Stopping existing spawned dash process with pid: 3536
[2018-01-14T15:25:25.229Z] warn: Unclean dash process shutdown, process not found with pid: 3536
[2018-01-14T15:25:30.241Z] warn: Loading governance cache...
[2018-01-14T15:25:35.751Z] warn: ZMQ connection delay: tcp://127.0.0.1:28332

Why I this is warning about bitcore-lib?

P.S. After install by guild, I remove "/root/dashnode/node_modules/dash-payment-processor/bitcore-lib-dash" folder, because dash node can't run and snogcel member tell me about this remove folder.

Network is: livenet
Sync Status: 100%

dashd.conf

listen=1
server=1
whitelist=127.0.0.1
txindex=1
addressindex=1
timestampindex=1
spentindex=1
zmqpubrawtx=tcp://127.0.0.1:28332
zmqpubrawtxlock=tcp://127.0.0.1:28332
zmqpubhashblock=tcp://127.0.0.1:28332
rpcallowip=127.0.0.1
rpcport=9998
rpcuser=dash
rpcpassword=local321
uacomment=bitcore
debug=1

Thanks.

P.S. I see interesting moments, if I try to send RPC command, and RPC connection is incorrect port after ~5 min. Dash is down.
And netstat -tunlpn is not changes. Core is work, because address is gen, so just insight is down?
Also didn't think my unit process problem, because I see again just warning.

 

[moocowmoo]

If dash is up, then down. Check free ram and swap. Sounds like it's running out of memory, but I'm just guessing.

What does

free -m

output show?

 

[Skrutch]

RAM is good

total used free shared buff/cache available
Mem: 32042 940 30381 24 720 30697
Swap: 487 0 487

What warning about bitcore-lib?