Client request error: socket hang up on POST /oauth/token

Help
,
1

Resource-owner-password request returns this response:

{
	"error": "access_denied",
	"error_description": "Client request error: socket hang up"
}

Production environment
Frequency: not often
LogId: 90020240201225716417642000000000000001223372069693750353

What could be a reason?