Nat Gas (QG) mystery

This is a daily chart of the QG contract in ESignal.
"QG #F" (forward ctrct) is the symbol.

Why does the volume die off at the end of every month? Is the volume in QG actually dying off or do people roll to a different contract out of sync with ESignal's #F?

 

people roll to the next month.

The QG is very illiquid.

 

I don't know about QG specifically.

eSignal rolls over to the next contract on the last trading day: most traders do it earlier, usually onthe first notice day.

 

Thanks for your replies.
Oops, forgot to attacht the chart, here it is.