Unbound notice: sendto failed: No buffer space available

[gjaltemba]

My log normally has ~100-200 entries per 30 minutes but sometimes unbound will spam my log with 12,000 messages. The list of root server in the log messages changes. Everything seems to be normal and the messages will stop. What to do?

notice: sendto failed: No buffer space available
notice: remote address is 192.58.128.30 port 53