Can I specify/change wifi channels on Arris W121 Ping reports poor quality on ALL the channels (36,40,44,48,52) for my wifi. quality is Medium or Very good for others. Performance is lousy for iOS devices (iPad and iPhone), but excellent for MacBook and Samsung TV connected via ethernet directly to routers. CHANNEL QUALITY ACCESS POINTS WHO'S CONNECTED 44 Poor 26 This PCDIRECT-79-HP ENVY, SpectrumSetup-89, Spectrum Mobile, ATTBjTnBA2, ATT8uCHTJA, Kissmygrits, Sky WiFi, Sasquatch, TP-Link_E8CB_5G, reno2D, ATTUmXpUIa, Spectrum Mobile, Spectrum Mobile, NETGEAR05-5G, Connecttheworld, SpectrumSetup-78, ATTkDG6r3A, ATTI6NdA22, SpectrumSetup-21, AAT4uyy7Dh, ATT76Jd3UI, Spectrum Mobile, SpectrumSetup-D7, Bacon_is_best, I Wish My Wife Loved Me, I Wish My Wife Loved Me Guest