Downstream crawling / Upstream still fast

Hello -

I have been having an issue with my connection for the past 2-3 weeks. I pay for 300mbps down / 30mbps up and have had no issues until now. I am getting between <1mpbs to around 7mbps down at best. Unacceptable. I used to regularly get 300mb down and sometimes even faster at non-peak times. I've done all the troubleshooting COX suggested and now they want me to change out my cable modem as a troubleshooting step and (of course) recommend I rent the modem from them. No thanks. I'd rather pay for my own and not give another $10-$15 per month to Cox. My question is this: how can the problem be the modem if it is still capable of providing the advertised upstream speed? I have made no changes to the topology. Here are my modem's stats (below) if it helps. I don't know how to read them, so maybe someone here with more experience can tell me where the problem lies. Thanks, all!

Model: Arris SB6190

Startup Procedure
Procedure
Status
Comment
Acquire Downstream Channel

Locked
Connectivity State
OK
Operational
Boot State
OK
Operational
Configuration File
OK

Security
Enabled
BPI+
DOCSIS Network Access Enabled
Allowed



Downstream Bonded Channels
Channel
Lock Status
Modulation
Channel ID
Frequency
Power
SNR
Corrected
Uncorrectables
1
Locked
256QAM
33
357.00 MHz
-3.20 dBmV
33.06 dB
11
0
2
Locked
256QAM
1
783.00 MHz
-15.70 dBmV
27.47 dB
6478795
1843
3
Locked
256QAM
2
789.00 MHz
-16.80 dBmV
26.75 dB
41165254
7233145
4
Not Locked
----
3
795.00 MHz
----
----
----
----
5
Not Locked
----
4
801.00 MHz
----
----
----
----
6
Not Locked
----
9
831.00 MHz
----
----
----
----
7
Not Locked
----
10
837.00 MHz
----
----
----
----
8
Not Locked
----
11
843.00 MHz
----
----
----
----
9
Not Locked
----
12
849.00 MHz
----
----
----
----
10
Not Locked
----
17
879.00 MHz
----
----
----
----
11
Not Locked
----
18
885.00 MHz
----
----
----
----
12
Not Locked
----
19
891.00 MHz
----
----
----
----
13
Not Locked
----
20
897.00 MHz
----
----
----
----
14
Not Locked
----
21
903.00 MHz
----
----
----
----
15
Not Locked
----
22
909.00 MHz
----
----
----
----
16
Not Locked
----
25
927.00 MHz
----
----
----
----
17
Not Locked
----
26
933.00 MHz
----
----
----
----
18
Not Locked
----
27
939.00 MHz
----
----
----
----
19
Not Locked
----
28
945.00 MHz
----
----
----
----
20
Not Locked
----
29
951.00 MHz
----
----
----
----
21
Not Locked
----
30
957.00 MHz
----
----
----
----
22
Locked
256QAM
34
363.00 MHz
-3.50 dBmV
33.06 dB
0
0
23
Locked
256QAM
35
369.00 MHz
-4.00 dBmV
32.58 dB
0
0
24
Locked
256QAM
36
375.00 MHz
-4.50 dBmV
31.92 dB
0
0
25
Locked
256QAM
37
381.00 MHz
-4.20 dBmV
32.70 dB
0
0
26
Locked
256QAM
38
387.00 MHz
-4.10 dBmV
32.90 dB
0
0
27
Locked
256QAM
41
405.00 MHz
-2.80 dBmV
34.50 dB
0
0
28
Locked
256QAM
42
411.00 MHz
-1.90 dBmV
34.50 dB
0
0
29
Locked
256QAM
43
417.00 MHz
-1.70 dBmV
35.40 dB
0
0
30
Locked
256QAM
44
423.00 MHz
-1.60 dBmV
35.40 dB
0
0
31
Locked
256QAM
45
429.00 MHz
-2.70 dBmV
34.90 dB
0
0
32
Locked
256QAM
46
435.00 MHz
-2.60 dBmV
34.80 dB
0
0


Upstream Bonded Channels
Channel
Lock Status
US Channel Type
Channel ID
Symbol Rate
Frequency
Power
1
Locked
ATDMA
3
5120 kSym/s
32.40 MHz
43.75 dBmV
2
Locked
ATDMA
4
5120 kSym/s
38.80 MHz
45.25 dBmV
3
Locked
ATDMA
2
5120 kSym/s
26.00 MHz
43.75 dBmV
4
Locked
ATDMA
1
5120 kSym/s
19.60 MHz
41.75 dBmV



Current System Time: Sun Jul 28 00:00:34 2019