[Sephiroth]

Originally Posted by GMCinema

Cable Modem Downstream
DS-1 DS-2 DS-3 DS-4
Frequency 299000000 307000000 315000000 323000000
Lock Status
(QAM Lock/FEC Sync/MPEG Lock) Y/Y/Y Y/Y/Y Y/Y/Y Y/Y/Y
Channel Id 5 6 7 8
Modulation 256QAM 256QAM 256QAM 256QAM
Symbol Rate
(Msym/sec) 6.952 6.952 6.952 6.952
Interleave Depth I=12
J=17 I=12
J=17 I=12
J=17 I=12
J=17
Power Level
(dBmV) 1.56 1.75 1.64 1.77
RxMER
(dB) 30.65 30.88 31.01 31.07
Correctable
Codewords 427166789 294589043 225646075 212412201
Uncorrectable
Codewords 486 520 446 480


SNR values have dropped by about 5dB over the last few days and correctable codewords count has shot up ..... Madness .....

Igni's advice is sound. Your SNR is at the lower threshold for 256QAM and if all your home connexions are sound, including in the wall box, an engineer is required.