Modem Downstream Levels drop during the day

My modem downstream levels did not fluctuate much until 6/23/17. I lost internet for a few minutes and when it came back the levels were lower but speed was the same  >150.  Now the levels drop during the day but still getting Premier speed >150.  Not all the downstream channels are affected the same, channels 2 and 3 are the worst.  It look like there is a amplifier with a temperature problem feeding my part of Cox Cable. A s/n ratio of 31.9 on channel 2 at 7 P.M. seems like it is getting out of spec.

I would appreciate comments.

Modem Status on 6/23/2017 at 2:48 P.M.

Downstream Channels

Power Level: Signal to Noise Ratio:
Channel 1: -2.6 dBmV 39.0 dB
Channel 2: -2.1 dBmV 39.1 dB
Channel 3: -2.8 dBmV 38.4 dB
Channel 4: -3.0 dBmV 38.8 dB
Channel 5: -3.2 dBmV 38.5 dB
Channel 6: -3.3 dBmV 38.8 dB
Channel 7: -3.3 dBmV 38.5 dB
Channel 8: -3.4 dBmV 38.6 dB

Upstream Channels

Power Level:
Channel 1: 37.0 dBmV
Channel 2: 32.7 dBmV
Channel 3: 34.2 dBmV
Channel 4: 35.7 dBmV
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Modem Status on 6/23/2017 at 2:51 P.M. Lost Internet for 3 minutes.

Downstream Channels

Power Level: Signal to Noise Ratio:
Channel 1: -7.2 dBmV 36.7 dB
Channel 2: -10.0 dBmV 35.2 dB
Channel 3: -9.2 dBmV 35.8 dB
Channel 4: -8.4 dBmV 36.1 dB
Channel 5: -8.1 dBmV 36.6 dB
Channel 6: -8.1 dBmV 36.5 dB
Channel 7: -7.2 dBmV 37.0 dB
Channel 8: -7.7 dBmV 36.2 dB

Upstream Channels

Power Level:
Channel 1: 37.0 dBmV
Channel 2: 32.5 dBmV
Channel 3: 34.0 dBmV
Channel 4: 35.5 dBmV
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Modem Status at 5:30 A.M. 6/25/2017

Model: Cisco DPQ3212
Vendor: Cisco
Hardware Revision: 1.0
MAC Address: e4:48:c7:0f:b9:2e
Bootloader Revision: 2.3.0_R1
Current Software Revision: d3200-P10-5-c1000r5593-150324a-COX
Firmware Name: d3200-P10-5-c1000r5593-150324a-COX.bin
Firmware Build Time: Apr 1 10:01:32 2015
Cable Modem Status: Operational

Cable Modem State
DOCSIS Downstream Scanning: Completed
DOCSIS Ranging: Completed
DOCSIS DHCP: Completed
DOCSIS TFTP: Completed
DOCSIS Data Reg Complete: Completed
DOCSIS Privacy: Enabled

Downstream Channels
Power Level: Signal to Noise Ratio:
Channel 1: -5.8 dBmV 37.3 dB
Channel 2: -7.7 dBmV 36.5 dB
Channel 3: -7.3 dBmV 36.6 dB
Channel 4: -6.7 dBmV 36.6 dB
Channel 5: -6.7 dBmV 37.0 dB
Channel 6: -6.7 dBmV 36.9 dB
Channel 7: -6.0 dBmV 37.2 dB
Channel 8: -6.4 dBmV 36.8 dB

Upstream Channels
Power Level:
Channel 1: 34.5 dBmV
Channel 2: 33.5 dBmV
Channel 3: 35.0 dBmV
Channel 4: 37.0 dBmV

---------------------------------------------
Modem Status at 7:00 P.M. 6/25/2017

Downstream Channels
Power Level: Signal to Noise Ratio:
Channel 1: -7.5 dBmV 36.5 dB
Channel 2: -14.4 dBmV 31.9 dB
Channel 3: -11.8 dBmV 34.1 dB
Channel 4: -10.0 dBmV 35.0 dB
Channel 5: -9.1 dBmV 36.2 dB
Channel 6: -8.6 dBmV 36.1 dB
Channel 7: -7.5 dBmV 36.7 dB
Channel 8: -7.8 dBmV 36.2 dB

Upstream Channels
Power Level:
Channel 1: 34.5 dBmV
Channel 2: 33.5 dBmV
Channel 3: 36.5 dBmV
Channel 4: 37.0 dBmV