GUI is showing sudden drop in active connection

Hi Experts,

I need to analyse my F5 traffic, The traffic was showing continuous around 100k active connection in GUI graph, but suddenly it drop from 100k to 10k. Not sure what is happening in F5,

If we say it can be due to less number of traffic we receiving, but its not new connection graph is showing same number of connection.

What logs required to check on this? Is it the case statsd process not properly showing the graphs?

Thanks,

Mayur