I am using Fios/ethernet. I am using a e-series linksys router, and a re6700 extender. After setting up manually or via wps button, it appears to work fine. Then it starts dropping the wifi signals every 10 min or so. I have reset and followed directions carefully. I have also combined the SSID’s for the 2.4 and 5, and separated them. same results. What is the probable cause?