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CM8200 Upstream Light flashings and Online light off

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Level 1a
Hello all, my CM8200 Modem is not working. The upstream light is flashing and the online light is off, I have tried rescrewing all of the cables, and hard resetted both the modem and router many times. This has become very annoying, as it happens a lot and I usually have to wait it out until it fixes itself. Thanks in advance for any replies!