varnish crush every 30 minutes in high pressure

Sat Sep 26 10:39:23 UTC 2020

Hi
Im using varnish , before i hadn't any problem in varnish but today after crushing my dns (I fixed it now) and in high pressure , it
restart whole machine almost every 30 minutes even Netdata that i'm using for monitoring and it shows in service status:

Sep 26 13:49:48 varnish-1 varnishd[945]: Child (1548) not responding to CLI, killed it.
Sep 26 13:49:48 varnish-1 varnishd[945]: Unexpected reply from ping: 400 CLI communication error (hdr)
Sep 26 13:49:48 varnish-1 varnishd[945]: Child (1548) died signal=9

What should i do for this problem?
My varnish version:

varnishd (varnish-6.0.5 revision 3065ccaacc4bb537fb976a524bd808db42c5fe40)
Copyright (c) 2006 Verdens Gang AS
Copyright (c) 2006-2019 Varnish Software AS

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