About 6 months ago, I moved from an apartment to a house on the same Comcast system. I have a Motorola SB6141 modem. The day after I called to move the service (a couple days before I moved), the speeds went to crap (60mpbs to a couple mbps), but I didn't really care, as I was moving. I moved into the house with 3 roommates, and for a week, we had horrific problems getting the internet working properly. It would often be .5mbps, with the full 12mbps upload. After days of swapping it to basically every different cable in the house, checking levels over and over and over, and calling Comcast several times and re-provisioning the modem over and over, they sent a guy out, he checked everything, and told me to try a new modem from the Comcast office. I got the new modem, and voila! everything worked fine.
Fast forward 6 months, and I'm tired of paying their absurd rental fees for a modem, so I tried swapping in the owned modem, but it was only giving me about 10mbps. I called them, and after getting bounced around their tech support several times, got it re-provisioned and working correctly (PB around 100mbps, evening out to about 60mbps). This morning, it was still working fine, so I returned the rented modem to them, and I come home and it's broken again. After two reboots, it now gets 37mbps, which is even weirder.
What the heck did they do to my modem and how do I get them fix it? Re-provisioning doesn't change anything, and it still intermittently breaks. They can't even figure out what's wrong, and they're usually unwilling to help. I don't want to have to buy a new modem because these idiots broke mine. When the other cable company gets more channel or Comcast enables their data cap, I also can't really switch to the other cable company with a modem that Comcast broke and expect them to do anything about Comcast's problem, so unless I can get Comcast to fix it, I'll have to buy a new one.
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