Post what modem you have and your power levels from your config pages of your modem. The should be a sticker on the bottom saying what model.
Open a browser and in the address bar put or click the link >
http://192.168.100.1/ the password and username are both root if required.
What I want you to post is the Downstream power levels including the SNR and the Upstream power levels for me thanks.
DO NOT POST YOUR MAC ADDRESS OR SERIAL NUMBER