Only one Upstream Bonded Channel and Downstream Bonded Channels outside acceptable power level range

[Nakamikado]

My Arris SB6190 cable modem is indicating there is something amiss with my internet connection. After doing some research I found that I only have one Upstream Bonded Channel, when I should have up to 8, and my Downstream Bonded Channels are outside the acceptable power level range of - 15 dBmV to + 15 dBmV (Currently running between -25.5 and -22 across all channels) I have two questions:

1. How do I get the power levels on the Downstream Bonded Channels into the appropriate range?

2. Will a provisioning request from Xfinity correct the Upstream Bonded Channel deficiency as I have seen done on another thread on this forum? (I believe it was @ComcastChe who provided the solution)

[EG]

FWIW, Comcast currently only provides 3 or 4 upstream channels depending on one's local area. You'll never see 8.

And re-provisioning the device will not affect the number of channels or the power levels.

The downstream power is way out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

[Nakamikado]

I live in an apartment and the only coax cable I've got is the one Xfinity provided to go from the wall to the modem. I may have to have a tech come out to check the external connecter/splitters. Would this also affect my internet speed, because I'm only getting 1-6 Mbs and before 2 days ago I was getting 25-40 Mbs, very similarly to this forum post: https://forums.xfinity.com/t5/Your-Home-Network/Only-one-upstream-and-downstream-bonded-channel/m-p/... 

[EG]

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@Nakamikado wrote:

Would this also affect my internet speed, because I'm only getting 1-6 Mbs and before 2 days ago I was getting 25-40 Mbs,

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Yes !