Gracias. No es ese el mismo problema mio ya que la luz online conecta perfectamente y se mantiene fija.
Tengo duda de poner el BPI Enable en false o true. He probado con los dos y creo que me va mejor con false. Mis datos de telnet son estos:

+---------------------------+
| CM DOCSIS NonVol Settings |
+---------------------------+
Magic Number = 0xd******0 '....' "borrado"
Version (Permanent) = 0.2
Version (Dynamic) = 0.3
Is Default (Permanent) = false
Is Default (Dynamic) = false

DOCSIS Cable Modem Permanent NonVol Settings:

Scan Single DsChan Enabled = false
BPI Enabled = false
Concatenation Enabled = true
Fragmentation Enabled = true
PHS Enabled = true
IGMP Enabled = true
Rate Shaping Enabled = true
DOCSIS 1.1 Features Enabled = true
DHCP Enabled = true
Time Of Day Enabled = true
Config File TFTP Enabled = true
Canned Registration Enabled = false
One-line RNG-RSP Enabled = false
Advanced PHY Enabled = true
DOCSIS 2.0 Hack for 1.x CMTS = false
BPI23 (secure s/w dload) Enabled = true
Optimized Initial Ranging Enabled = true
Force Config File Enabled = false
AckCel technology Enabled = true
Upstream Queues Enabled = 0 (all queues can be used)
BPI Version = 0
Disabled DOCSIS Timers = 0x0 ({None})
Concatenation Threshold = 2 packets
Rate Shaping Time Interval = 2 seconds
TFTP Retry Timeout = 20 seconds
IP Stack Number = 1
Max UGS Queue Depth = 3 packets
Max Concat Packets = 64 packets

If DHCP is not enabled, then the following settings will be used:

DHCP Settings:
My offered IP address = 10.10.10.10
Subnet Mask = 255.255.255.0
Router IP address = 10.10.10.254
TFTP Server IP address = 10.10.10.254
CM Configuration file = 'cm.bin'
Time Server IP address = 10.10.10.254
Log Server IP address = 10.10.10.254

DOCSIS Cable Modem Dynamic NonVol Settings:

Downstream Frequency = 633000000 hz
Upstream Channel = 3
Upstream Power = 170 quarter dBmV (42.50 dBmV)
Docsis10IgmpSupportEnabled = true
Docsis10IgmpMulticastPromiscEnabled = false
Startup Target DsFreq = 0 hz
Startup Target UsChannel = 0
Startup Target Context = 0

Si alguien ve algo que podria cambiar.

El problema es que pierde la conexion. He probado por Usb y tambien llega a fallar. Segun he leido en otro foro no soy al unico al que le pasa.

Gracias por responderme. Saludos