Bad gas?

[MissHell]

Is there such thing as bad gas?
I always put premium Chevron gas in my bike.

Yesterday I had 85 miles on my bike, I normally fill around 100. I met up with some friends. I rode on the highway to the designated spot - no problem.

No problems starting my bike. We pull out to ride and every time I slow to turn or stop, my bike dies. No lights coming on and it starts back up every time no problem.

One of the gals said she had the same problem and it was bad gas.

We went to the gas station and I filled up the tank, no problems after that.

Just wondering what happened? Can I avoid it from happening again? Do I need to have the bike checked? I just had 4k service done a few months ago.