Xfinity says I have a modem problem; Modem manufacturer says I have a cable problem
I've been experiencing significantly lower internet speeds (2-300mbps) than I'm paying for (1 gig).
A service technician came out to the house to test the line but was unable to -- he seemed to be an inexperienced contract worker who had to call his boss to figure out how to even do so. In the end, both he and the phone representative say it must be a problem with my modem.
I have an Arris T25, which is relatively new and has not had problems until recently. It's a high quality modem on Xfinity's approved list.
The modem manufacturer ran diagnostics and their end and said I am receiving low upload power from the cable company.
Can comcast increase my upload power? Seems silly that I'd have to go spend hundreds of more dollars for a different modem.