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I am having the exact same issue with my Arris Surfboard 6200 modem. Network is dropping sporadically with T3/T4 errors. Please help.
What do the modem's signal stats look like ? Try getting them here http://192.168.100.1 or here http://10.0.0.1
Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.