"limited by wifi extender"

My wifi extender closest to the gateway is showing on the app an orange "limited by wifi extender" status. this extender st this location was always excellent. And thus the next extender is showing limited. I had issues but after hours with the live support chat last night,  I would not have any issues. Before xfinity and even with my initial gateway, I have never needed any additional wifi extenders. now with this gateway and buying two extenders I continue to have issues