I have a new condition with my sump pump. It runs for a few minutes (like normal) and then it stops for a few seconds and runs for a few seconds over and over (maybe 10 times). This happens every time the sump pump runs. It has been doing this for the last couple months and I'm concerned that this is causing additional wear on the pump. I installed a battery backup pump on the same outbound pipe last fall, but it has been running fine with that install for many months.
Any ideas on the cause or how to narrow down the cause?