I recently got a new router, hence a new WAN IP address, so my BQM graph stopped working.
Rather than just change the IP address of the ping probe to the new one, I decided to use a domain name (from a free "DNS" provider). I had been using this DDNS name for a while and was pleased to see that it had successfully updated itself with my new IP address, so I created a new graph, using the DDNS name instead of my new IP address.
However I soon noticed that the new graphs had gaps in, as in this example:
(the gaps are most obvious in the green band at the bottom of the graph)
I suspect that this is due to some sort of failure in the DNS lookup of my domain name but I'd welcome any thoughts on this "problem".