I got an S34 a few months ago to replace an older DOCSIS 3.0 Arris modem on Xfinity to get higher speeds, and this model is recommended for my address by Xfinity. It worked fine for a few months, but then in the past couple weeks started dropping connection multiple times a day, sometimes recovering on its own, sometimes requiring a hard reboot. The logs show a lot of connection issues:
REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value
RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW
SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;
RCS Primary DS Failure
Various other T3 failures
It runs fine often all day at max speeds, then in the evening and/or early morning it drops out with uncorrectable errors and struggles to resync with Xfinity. Often I need to hard reboot it.
Xfinity tech was here today and removed an old filter and splitter in the block which got me from 30Mbps upload to 350. He said, however, that the head was saying the modem was not responding correctly and that it was only rated for 500Mbps. ?! When this is clearly an S34. He said it was not responding in a healthy manner even after reprovisioning it. Of course, it was working when he arrived mid-day, and the upstream was now faster, but then 7pm tonight like clockwork it goes down again.
On the current reboot I notice the upstream power is a little lower than it was mid-day now:
| 2 | Locked | SC-QAM | 22800000 Hz | 6400000 | 44.0 dBmV |
| 4 | Locked | SC-QAM | 35600000 Hz | 6400000 | 45.5 dBmV |
| 3 | Locked | SC-QAM | 29200000 Hz | 6400000 | 44.5 dBmV |
| 1 | Locked | SC-QAM | 16400000 Hz | 6400000 | 43.8 dBmV |
| 41 | Locked | OFDMA | 36200000 Hz | 44400000 | 33.5 dBmV |
when they were all 45 or above, but it is working.
The modem also get very hot as noted by others, but adding a fan hasn’t helped either.
Since this worked fine for a few months and now is not working, I am suspecting the modem has gone bad, although I see a lot of others with similar issues. What’s going on here? Xfinity says this modem should work but says that my particular modem isn’t responding in a healthy way. It is well within warranty. What do I need to do?
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