DNS resolution issue

Issue

• What is the reason for below DNS error messages?

Feb 27 00:36:23 hostname dnsmasq[1899]: Maximum number of concurrent DNS queries reached (max: 150) 
Feb 27 00:36:31 hostname dnsmasq[1899]: Maximum number of concurrent DNS queries reached (max: 150)
Feb 27 00:40:38 hostname dnsmasq[2231]: using nameserver x.x.x.x#53 for domain <domain-name>
Feb 27 00:40:38 hostname dnsmasq[2231]: using nameserver x.x.x.x#53 for domain <domain-name>
Feb 27 00:40:38 hostname dnsmasq[2231]: read /etc/hosts - 4 addresses
Feb 27 00:40:39 hostname dnsmasq[2231]: nameserver x.x.x.x refused to do a recursive query
Feb 27 00:40:41 hostname dnsmasq[2231]: Maximum number of concurrent DNS queries reached (max: 150)
Feb 27 00:40:48 hostname dnsmasq[2231]: Maximum number of concurrent DNS queries reached (max: 150)
Feb 29 19:47:33 hostname dnsmasq[27913]: nameserver x.x.x.x refused to do a recursive query