I am pretty sure I am having the same problem . Recently , my comcast modem has been scetchy , then died altogether . I wanted to get a new modem , but comcast made me get a modem / router combo ( TC8305C ) It was fine for maybe a day . then it has been going crazy , first its giving me 30 mbps upload ( paying for 25 mbps ), then 20 minutes later i have gotten .4 mbps upload . It has gotten to a point where it is inposible to use because it just stops working . My bedroom is right next to the router , so i do not think it is a connection problem . I still have the router that i was using before , and was hoping to use that , but use the existing router / modem as just a modem . any ideas ?
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