Extreme Speed Drops in the Afternoon

[denn020]

Most afternoons my gigabit service  drop to unusable speeds. I work from home and upgraded my services and hardware several months ago. I can tell when the speed drops when my work applications no longer work.

On a hard wired computer my internet download goes from over 900mbps to 400mbps and my upload goes from 40mbps to under 2mbps (I get these speeds using 3 different speed test websites). I get the same speeds using the speed test on my orbi router which is plugged into the xfinity modem. I can do a speed test from my computer to my router and I have gigabit speeds on my internal network. 

I had a tech come out who replaced some outside hardware that was older but the issue hasn't gone away. I looked at my modem and the values do not seem off except the CM errors.

Index	20	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	21	22	23	24	25	26	27	28	29	30	31	32	193
Lock Status	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked
Frequency	543 MHz	423 MHz	429 MHz	435 MHz	441 MHz	447 MHz	453 MHz	459 MHz	465 MHz	471 MHz	477 MHz	483 MHz	489 MHz	495 MHz	507 MHz	513 MHz	519 MHz	525 MHz	531 MHz	537 MHz	549 MHz	555 MHz	561 MHz	567 MHz	573 MHz	579 MHz	585 MHz	591 MHz	597 MHz	603 MHz	609 MHz	615 MHz	690 MHz	611600000
SNR	43.8 dB	43.8 dB	43.6 dB	43.6 dB	43.5 dB	43.5 dB	43.5 dB	43.2 dB	41.8 dB	43.3 dB	43.2 dB	43.3 dB	43.2 dB	43.3 dB	43.4 dB	43.3 dB	43.4 dB	43.5 dB	43.6 dB	43.5 dB	43.6 dB	43.9 dB	43.7 dB	43.9 dB	43.8 dB	43.9 dB	44.0 dB	43.9 dB	42.5 dB	43.0 dB	43.7 dB	43.9 dB	42.9 dB	NA
Power Level	-8.0 dBmV	-8.5 dBmV	-8.5 dBmV	-8.5 dBmV	-8.6 dBmV	-8.7 dBmV	-8.6 dBmV	-8.8 dBmV	-8.8 dBmV	-8.8 dBmV	-8.8 dBmV	-8.7 dBmV	-8.7 dBmV	-8.7 dBmV	-8.6 dBmV	-8.5 dBmV	-8.4 dBmV	-8.2 dBmV	-8.3 dBmV	-8.2 dBmV	-7.9 dBmV	-7.8 dBmV	-7.7 dBmV	-7.6 dBmV	-7.6 dBmV	-7.4 dBmV	-7.3 dBmV	-7.2 dBmV	-7.2 dBmV	-7.2 dBmV	-7.3 dBmV	-7.2 dBmV	-7.0 dBmV	NA
Modulation	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	OFDM	OFDM
Upstream	Channel Bonding Value
Index	1	2	3	4
Lock Status	Locked	Locked	Locked	Locked
Frequency	35 MHz	29 MHz	23 MHz	16 MHz
Symbol Rate	5120	5120	5120	5120
Power Level	47.0 dBmV	46.8 dBmV	46.3 dBmV	46.5 dBmV
Modulation	QAM	QAM	QAM	QAM
Channel Type	ATDMA	ATDMA	ATDMA	ATDMA
CM Error Codewords
Index	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33
Unerrored Codewords	3040441601	2501364967	2527683396	2527688970	2527694663	2527703060	2527715363	2312357322	2527772149	2503459420	2527796301	2527806558	2527807515	2527814141	2527822182	2527829854	2527834447	2527837876	2527843216	2527852275	2527862077	2527865477	2527873515	2527882313	2527898302	2527904426	2527913604	2527917170	2527927647	2527933437	2527938762	2527926059	3040441601
Correctable Codewords	678252455	66	322	288	291	269	289	302	279	204	327	313	333	353	379	325	234	416	387	386	429	404	386	329	426	411	414	433	290	390	298	467	678252455
Uncorrectable Codewords	1378	135	1094	1103	1048	1108