WiFi extender dropping connection

Having intermittent dropping of the Ethernet line plugged in to the extender as well as the actual WiFi itself coming from the extender. I have the most current firmware for this extender and we even just went and got a new modem and router from our cable company in hopes that it would solve my connectivity issues, but alas it has not. I’m not sure what is causing the connectivity issues, but I need to find a fix because this has been happening for at least a month now and I don’t want to go out and buy a different extender.