Xfinity internet speed drops from normal speeds to low speeds minutes after modem restart

I have a 100Mbps internet plan, and I am using a NetGear CM400 modem. Internet speed always starts >100Mbps right after modem restart. Then after 10-15 minutes, it goes to about 10Mbps. This issue happens both when using Wifi Router and when connecting to modem directly using an ethernet cable.

I have seen that many users are having similar issues.

My signal levels are as below when the modem is directly connected to data line with ~10ft cable without any splitter. Does anyone know if these signal levels are reasonable? Given that at first the speeds are high and expected, is it possible that this is due to some kind of throttling on the ISP side? Is there a way to figure this out?

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	UnCorrectables
1	Locked	QAM 256	33	597000000 Hz	-5.3 dBmV	34.9 dB	42	2177
2	Locked	QAM 256	34	603000000 Hz	-6.4 dBmV	34.2 dB	20	3042
3	Locked	QAM 256	35	609000000 Hz	-7.2 dBmV	33.8 dB	8	3045
4	Locked	QAM 256	36	615000000 Hz	-7.1 dBmV	33.7 dB	120	3022
5	Locked	QAM 256	37	621000000 Hz	-6.6 dBmV	34.6 dB	35	2923
6	Locked	QAM 256	42	627000000 Hz	-9.2 dBmV	32.7 dB	58	3765
7	Locked	QAM 256	39	633000000 Hz	-8.8 dBmV	33.1 dB	38	3047
8	Locked	QAM 256	40	639000000 Hz	-8.0 dBmV	33.3 dB	23	3133

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	1	5120 Ksym/sec	16400000 Hz	44.0 dBmV
2	Locked	ATDMA	2	5120 Ksym/sec	22800000 Hz	44.5 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	29200000 Hz	46.0 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	35600000 Hz	46.0 dBmV

This conversation is no longer open for comments or replies and is no longer visible to community members.

Your Home Network

randommess67

Xfinity internet speed drops from normal speeds to low speeds minutes after modem restart

No Responses!

New to the Community?