I was the user who requested CRC_RETRAIN_THRESHOLD to be changed (Sébastien = a genuine rebelz ;)). With its default value (4), my modem rebooted very often (something like every 15 min). I have experienced no disconnections since I set it to 10. That would mean a modem "sleeping" more than 4 seconds does not necesseraly need a reboot and can even "wake up". Actually, I followed the comment "about 10 secs of continuous CRC to cause retrain" in Sm.c file.
Please pardon my school English
