I have set up a bitcoin testnet node in ubuntu . It gets fully synced, after that the node crashes and shows this error "***SOCKET SENDING TIMEOUT***" in debug log.

Ubuntu version - Distributor ID: Ubuntu Description: Ubuntu 18.04.2 LTS Release: 18.04 Codename: bionic

Bitcoin node version - "version": 170100, "subversion": "/Satoshi:0.17.1/", "protocolversion": 70015, "localservices": "000000000000040d", "localrelay": true, "timeoffset": -1, "networkactive": true, "connections": 8,

This is my bitcoin.conf

rpcuser=****** rpcpassword=***** testnet=1 rpcallowip=0.0.0.0/0 server=1 txindex=1 maxconnections=8 txindex=1 listen=0 bantime=86900
reindex=1 port=18332 ` please help!