coaxial cable is sending/receiving poor signal

Arris and I have been testing internet connectivity.  According to Arris Tech Support, my coaxial cable is sending/receiving poor signal, and is affecting
the device itself to communicate properly.  They recommend that Comcast make the appropriate adjustments to those levels. If the levels they are sending are within those ranges, this will indicate a possible issue with a faulty cable splitter or a coaxial cable line in your area in need of maintenance.

According to Kanishya N: "We would recommend you contact your ISP and ask them to adjust the cable signal level for upstream power level between 45-51. And this will fix the issue."  Here is the relevant portion of the chat log:

( 19m 43s ) Kanishya N: Now, scroll down under Downstream QAM please check power levels and let me
know what is the highest and lowest value. Also check the SNR and provide me the highest and lowest
value.
( 20m 53s ) Estela: highest is 5.19997
( 21m 2s ) Estela: lowest is 4.800003
( 21m 26s ) Estela: SNR highest 43.376591
( 21m 59s ) Estela: lowest 40.946209
( 22m 2s ) Kanishya N: Great! Thank you for the information. Now Please check the Upstream QAM and
let me know how many channels are available and what is the highest and lowest value in power level.
( 22m 18s ) Estela: 4
( 22m 40s ) Estela: highest 34.270599
( 22m 49s ) Estela: lowest 32.770599
( 23m 2s ) Kanishya N: We found the cause for the issue, We need the power levels to be between 45-51