Why is there a big line on the shift graph ? Do we lose our 5nd or is there just a weird big line on the shift graph?
If you look at the shifts page (not the shift graph page) you see some very short shifts around 16:42. Depending on when your shares were returned it can calculate some crazy hashrates. One of those 0 second shifts has a hashrate 10x my real hashrate so there is a big spike on the graph page where that shift is for me.
Thats probably what you're seeing on your graph for your hashrate.