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Not getting new speed after upgrade, customer owned modem

RichMStation69
Regular Visitor

Not getting new speed after upgrade, customer owned modem

After upgrading service to 300mbps, (Blast) from 100mbps,  modem speed only changed for upload speed. Still stuck getting around 70mbs. Called support multiple times and spent a few hours troubleshooting. First one said it is a Netgear problem. Purchased another Motorola 7621, also the blame game, both brand new.  They said all is fine but did see a computer glitch (unable to fix due to automation???). They  also still showed my returned rented modem, local office said it is removed and don't see it.  Near the end of last tech call I was fed up after the tech said they can upgrade me to 600mbps, meanwhile they can't get me to 300!!! This really set me off. 

Anybody have any suggestions, I am listing the netgear connection status and event log.  Troubleshooting steps included multiple resets, reprovision, factory reset, direct connection to outside line direct from pole. Speedtest.xfinity.com showed as plan speed 100.

CM500-100NAS

Startup Procedure  
ProcedureStatusComment
Acquire Downstream Channel435000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDhonorMdd(4)
  
 
  
Downstream Bonded Channels  
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables
1LockedQAM2561435000000 Hz-0.5 dBmV44 dB00
2LockedQAM2562447000000 Hz-0.8 dBmV43.7 dB00
3LockedQAM2563453000000 Hz-1 dBmV43.7 dB00
4LockedQAM2564459000000 Hz-1.5 dBmV43.5 dB00
5LockedQAM2565465000000 Hz-1.8 dBmV43.1 dB00
6LockedQAM2566471000000 Hz-2.5 dBmV42.7 dB00
7LockedQAM2567477000000 Hz-3.7 dBmV42 dB00
8LockedQAM2568483000000 Hz-3.6 dBmV42.1 dB00
9LockedQAM2569489000000 Hz-2.4 dBmV43 dB00
10LockedQAM25610495000000 Hz-2.1 dBmV43 dB00
11LockedQAM25611507000000 Hz-1.7 dBmV40.9 dB00
12LockedQAM25612513000000 Hz-1.8 dBmV43.3 dB00
13LockedQAM25613519000000 Hz-1.3 dBmV43.5 dB00
14LockedQAM25614525000000 Hz-2.5 dBmV42.7 dB00
15LockedQAM25615531000000 Hz-3.6 dBmV42 dB00
16LockedQAM25616537000000 Hz-3.3 dBmV42.2 dB00
  
 
  
Upstream Bonded Channels  
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA755120 Ksym/sec23700000 Hz48.8 dBmV
2LockedATDMA735120 Ksym/sec36500000 Hz49 dBmV
3LockedATDMA745120 Ksym/sec30100000 Hz48.8 dBmV
4LockedATDMA765120 Ksym/sec17300000 Hz48.5 dBmV
  
 
  
Log  
TimePriorityDescription
1970-1-1, 00:00:28Notice (6)Honoring MDD; IP provisioning mode = IPv6
1970-1-1, 00:00:21Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-1-14, 19:00:25Critical (3)No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:01:5c:7c:12:67;CM-QOS=1.0;CM-VER=3.0;
2021-1-14, 19:00:18Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-1-14, 19:00:17Critical (3)No UCDs Received - Timeout;;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
2021-1-14, 19:00:00Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:01:03Critical (3)No Ranging Response received - T3 time-out;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:01:5c:7c:12:67;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:54Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:53Critical (3)No UCDs Received - Timeout;;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:36Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:24Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:23Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;
1970-1-1, 00:00:20Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=44:a5:6e:cd:42:88;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;