It looks normal to me... It's still receiving blocks and still has active connections? It just means that the remote host has shutdown or has stopped connecting to you (it might have reached it's maximum number of connections or soemthing). I'm not sure what the error is precicely but I always get it every couple of blocks and everything seems to work normally... It still broadcasts it's blocks and still keeps downloading so I don't think it's an error.
2019-06-04T16:49:26Z UpdateTip: new best=00000000000000000e956d9ebdef88922d3cbb8df62822cc58719bce227b292a height=344395 version=0x00000002 log2_work=82.277627 tx=60208151 date='2015-02-20T14:14:27Z' progress=0.144045 cache=772.9MiB(4345552txo)
2019-06-04T16:49:26Z socket recv error An existing connection was forcibly closed by the remote host. (10054)
2019-06-04T16:49:27Z UpdateTip: new best=000000000000000016038b3ec9076d16a824a4a6e4a6b944d80d3bd17ce915f3 height=344396 version=0x00000002 log2_work=82.277674 tx=60209100 date='2015-02-20T14:25:59Z' progress=0.144047 cache=772.8MiB(4344931txo)
2019-06-04T16:49:27Z UpdateTip: new best=000000000000000014a0c54b037eabadde70e6e7f76fbc84d6d90dfd177eda50 height=344397 version=0x00000002 log2_work=82.277721 tx=60209495 date='2015-02-20T14:45:50Z' progress=0.144048 cache=772.9MiB(4345110txo)
I'm getting it on both windows and linux so it doesn't seem to be a problem to me.