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AC1750 C6300 Blinking upload light & no download+internet light Optimum
I bought this modem/router on June and has been using Optimum serivce with it. Everything worked perfact at first but I've been noticing the upload, download and internet lights were either blinking ...
Factory reset it. disconnect coax, then while powered on, push and hold reset for 7-15 seconds.
Once done, reconnect coax, reboot it, then try reinstalling it.
If it reinstalls and works, recheck that cable connections page.
if its still showing offline, your isp needs to check the lines. you have t3/t4 errors/timeouts. usually means its not getting a signal.
Updating my situation. Finally the Optimum technician came and the coax cable didn't have signal. It turned out the coax cable from the backyard was disconnected. Once he reconnected it, the internet worked probably (at least for now). Altho it makes me think I should swtich to Verizon for a more stable internet...
The R6 series are older model routers so they are a few years old. You might consider getting into something newer for better wifi and internet performances.
Good Luck.