When I spam (Load test) my piholes with Dnsblast, I have this error many times and also when The Yacy Search engine is starting to crawl a lot of sites:
DNSMasq server load balancing to 3 piholes
I have set QOS with high priority in my router for DNS traffic
This seems to have quenched the Maximum number of concurrent DNS queries reached (max: 150) error message from turning up.
Hope that helps.
