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This is peer to peer support
Copy and paste your modems signal level and error log pages.
Are you measuring that speed with TWC's speedtest tool?
Are you sure your computer is set for 100 base and not 10 base?
What is the upstream speed?
Have you tried different cables?
Do you know how to copy and paste? you can do it from anywhere in the house you have a connection... If the router is in the basement and you're trying to use wireless to cover the house, Good luck, it won't .. Wireless access points must be in the center of the desired coverage area and up and away from other objects, even then the internal antenna stuff barely coversa 2 rooms.
You actually can't change anything in the modems, even if you own it. The level parametersfw version and error logs are all you can look at , it might require a user/password combo, all are googleable, lol. If it's a combo, you can change stuff on the router side.
make sure all coax connections in the house are a tad more than finger tight. I really need to look at the channel signal data for any further ideas as to where there's an issue, if you can't , then Call TWC/ spectrum, tell them it's intermittent and needs a tech out.
Read thru other conectivity posts, some are obvious easy fixes others are unresolved