Losing internet connection during large downloads.

Greetings everyone,

Ill try to keep this short and sweet. I have Charter as my cable ISP.
I have a Motorola SB5120 cable modem. I have had this setup for almost
2 years without any problems at all. Recently (about a month ago) I
began losing my internet connection during heavy downloading and then
about 5 minutes after that it would come right back (don't need to
restart the modem or anything just pops back on). I download from
newsgroups so this was when i first noticed this. After about 5
minutes of heavy downloading my connection would completely disappear,
downloads would stop and i could not get anywhere on the internet. The
strange thing was all the lights on my modem were still lit up.
I figured this must be a problem with my router so i replaced that.
Same thing happened. I figured well maybe my network card was bad,
still same thing. At this point i tried everything. I setup a new
account with a different Usenet server same thing, tried downloading
directly from a website with large files, same thing. Tried a laptop
on my network same problem so now im completely confused and ready to
give up and just live with it.
I decide what the hell i guess i could talk to Charter's tech support.
I was transfered to someone who i could tell immediately could not
speak English to well (not trying to knock the guy Ive come to expect
that now, and he works a lot harder than i do to earn a living so i
respect that). I tried explaining my situation to him and didn't get
very far so he transfered me to on of the head techs. We talked for
about 20 minutes while i my connection crashed and came back up and he
could see i was losing my connection but had no answers. He said he
opened a trouble ticket and that they would be working on it and have
it back up. Well that was 2 weeks ago and I haven't heard anything. I
have looked all over to find some similar issues and cant find
anything. I am hoping one of you out there will be my savior. If you
have any suggestions on what i can do to fix this i would realllly
appreciate it. Thanks in advance.

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