If you have a Motorola SB6141 surfboard cable modem and you are getting T3 Time out no ranging response received error messages a possible cause for this may be bad/swollen capacitors.
I've been having strange issues with my cable for a month now. had the cable company come out twice, the swapped out some splitters the first time, removed an un-needed MOCA filter, tested the lines and replaced one of the cable ends at the pedestal.
The strange part about this is that the problems occurred during the day starting about 7am (give or take 10 minutes) would be the worst till around 11am then be mildly annoying till 3pm where it would get bad again till about 8pm then be totally fine all night long.
I opened my cable modem and found this:
all the caps circled in red were swollen, I replaced them and all the other ones with the brand name of FOAI. so far as of 18 hours later my cable modem has been stable.
Not 100% sure what the cause was and maybe was multiple issues.