MB7621 modem bottleneck and slow speeds

I know this issue has come up on the forum before, but I haven't seen a solution. I have 800 Mbps service, but am only getting 15 Mbps. I should be at least getting 300. I've had a Comcast tech out to the house and cabling is getting plenty of speed into the modem itself. He checked the speed coming out of the modem. Less than 100. He said the problem is the modem. Please, any help would be great!

Cable Specification Version DOCSIS 3.0

Hardware Version V1.0

Software Version 7621-5.7.1.10

CM Certificate Installed 5.7.1mp4

Log

Time	Priority	Description
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=****;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=**;CMTS-MAC=**;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6

Startup Sequence

Startup Step	Status	Comment
Acquire Downstream Channel	591000000 Hz	Locked
Upstream Connection	OK	Operational
Boot State	OK	Operational
Configuration File	OK
Security	Enabled	BPI+

Connection Status

System Up Time	0 days 05h:40m:03s
Network Access	Allowed

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Freq. (MHz)	Pwr (dBmV)	SNR (dB)	Corrected	Uncorrected
1	Locked	QAM256	28	591.0	6.8	43.3	0	0
2	Locked	QAM256	21	549.0	6.1	42.5	0	0
3	Locked	QAM256	22	555.0	6.2	42.4	0	0
4	Locked	QAM256	23	561.0	6.3	42.7	0	0
5	Locked	QAM256	24	567.0	6.4	42.8	0	0
6	Locked	QAM256	25	573.0	6.5	42.9	0	0
7	Locked	QAM256	26	579.0	6.6	43.1	0	0
8	Locked	QAM256	27	585.0	6.7	43.1	0	0
9	Locked	QAM256	29	597.0	6.9	43.4	0	0
10	Locked	QAM256	30	603.0	6.9	43.4	0	0
11	Locked	QAM256	31	609.0	6.9	43.5	0	0
12	Locked	QAM256	32	615.0	7.0	43.5	0	0
13	Locked	QAM256	33	621.0	6.9	43.5	0	0
14	Locked	QAM256	34	627.0	7.0	43.7	0	0
15	Locked	QAM256	35	633.0	7.0	43.7	0	0
16	Locked	QAM256	36	639.0	7.2	43.4	0	0
17	Locked	QAM256	37	645.0	7.5	46.9	0	0
18	Locked	QAM256	38	651.0	7.6	47.0	0	0
19	Locked	QAM256	39	657.0	7.6	46.8	0	0
20	Locked	QAM256	40	663.0	7.7	47.0	0	0
21	Locked	QAM256	41	669.0	7.7	47.0	0	0
22	Locked	QAM256	42	675.0	7.9	47.2	0	0
23	Locked	QAM256	43	681.0	8.0	47.2	0	0
24	Locked	QAM256	44	687.0	8.1	46.9	0	0
Total							0	0

Upstream Bonded Channels

Channel	Lock Status	Channel Type	Channel ID	Symb. Rate (Ksym/sec)	Freq. (MHz)	Pwr (dBmV)
1	Locked	ATDMA	2	5120	22.8	39.8
2	Locked	ATDMA	1	5120	16.4	39.7
3	Locked	ATDMA	3	5120	29.2	39.2
4	Locked	ATDMA	4	5120	35.6	39.2
5	Not Locked	Unknown	0	0	0	0.0
6	Not Locked	Unknown	0	0	0	0.0
7	Not Locked	Unknown	0	0	0	0.0
8	Not Locked	Unknown	0	0	0	0.0

Your Home Network

user_qwjhte

MB7621 modem bottleneck and slow speeds

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