"Connections to all backends failing; last error:ipv6..."

The following error shows up in some of my charts. 

"connections to all backends failing; last error: ipv6:%5B2002:a17:50d:5c7:b0:94a:225f:7661%5D:4001: health check call failed; will retry after backoff"

The impacted charts are from differents types and they are not the same charts whenever I cross filter using the ones that load. I'm using postgres connector. Does any of you have any clue related to this error?

0 0 68