You're testing your modem at different coaxial wall-outlets throughout your house? Only one outlet should be the primary feed into your house.
I'd remove the wall plate of the 3 Mbps connection to inspect what's in there. I too was getting a constantly deteriorating signal, removed the wall plate and found an extra splitter on the cable. The extra splitter had a Cox label on it, so I suspect the first homeowner subscribed to Cox and because the next homeowner subscribed to DirectTV...(they left their satellite bolted onto my balcony)...they stuffed the CATV coax and splitter behind the wall outlet. I removed the extra splitter and my signal improved.
If you don't find an extra splitter, describe what you do see in there.
Thank you for your comments. I do have direct TV and only use Cox for internet. I was not aware that the modem should be on the primary feed, but that makes sense! I checked the line coming in and this is what i see.
The primary is hooked up to a two way splitter both are 3.5 DB output. I traced one output of that splitter to be the coax terminal wall outlet of the new location where i moved the modem. The other output of the splitter then goes to a 3 way splitter (3.5 db, 7db, 7db) only two of which are used. I traced the 3.5db output of the second splitter to the original coax terminal - at the previous location the signal was going through at least two splitters. One of the 7db outputs is hooked up, it must go to another room in the house.
It looks like the primary feed is not long enough to eliminate the use of the first splitter. i am going to check behind the wall outlet now.
Thanks again
I reads like you only need 3 splits: Primary Outlet, "New Location" Outlet and wherever the second split goes on the 3-way splitter.
Assuming the 3-way splitter is good (3 Mbps), I'd just replace the 2-way splitter with the 3-way splitter.
The "New Location" outlet is getting a good signal because it's only going through 1 splitter. All other outlets seem to be weak.
If you need/want a new splitter, I'll assume Cox recommends 1000 MHz (1 GHz). Also, only get the number of outputs you needs. The more ports on a splitter, the less signal it passes to each port. Unused ports would still weaken the signal.
Your Internet modem should be on a 3.5 dB outlet.
Thanks guys. I ended up removing all connected lines and using a 2 way splitter as a coupler for now. the only line connected is the one to the wall connection at the new location. After 24 hrs of streaming, browsing, gaming etc the number of uncorrectables is much lower and i have not experienced a disconnect yet. I think i just need one of these to replace the splitter https://www.showmecables.com/f-type-female-to-f-type-female-adapter?gclid=EAIaIQobChMIw9eR9ZCj5AIVBJyzCh3RBgAkEAYYASABEgIXVvD_BwE
if the coupler does not reduce or eliminate uncorrectables, maybe i do need a booster or a tech to come out since the only active line is connected to the modem
