These links are to DSLreports information regarding Intel's problem with there Puma 6 chip set seen in various Mfr cable modems:
Initial:
https://www.dslreports.com/forum/r31...Linear-mistake and
https://www.dslreports.com/forum/r31...sue-Discussion and https://www.dslreports.com/forum/r31...-ready-to-test

Recent problem found: 4/25/2017
https://www.dslreports.com/forum/r31377755-

Most cable modems with Intel's Puma 6 chip sets are effected. Users may want to contact there modem Mfrs if they are having problems with effected modems.