I reset the Archer C9 router and did a firmware upgrade and it is now rock solid. I have mounted it about 2 metres up a wall on the ground floor. This is giving me good reception on both floors and to all corners. I have 13 WiFi connected devices in the house (how did that happen?) and all are working fine.
Wow! That's wonderful. We are glad to know that the reset and the firmware upgrade of your router did the trick. Let us know should you require further assistance.
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