[nighterfighter]

We had a VERY similar problem at our school.

Our router was set to the 2.4Ghz setting, and usually it had no problems.

However, we are located next to a gym, and one day we were getting ping times ranging from 2ms to 800ms.

It turns out there was a basketball game going on in the gym, and their equipment was interfering with our router.

We switched to 5Ghz and didn't have a problem.