Internet Crashes

If I upload something.
Tried uploading parts of kMS for a friend cuz he was getting 3 kp/s from the Korean link: Crashed.
Tried uploading a 75 mb video to youtube: crashed. Then worked on 2nd try
Tried uploading a 1500mb video to youtube: crashed, internet's been on and off since.
It took me 5-10 minutes to go to my CP, unblock the tech section, go to the front page, go to the tech section, and make a new thread.

Why is it doing this? Ways I can fix it?
Thanks.

It kinda sounds like someone's using your interwebs. But that's just from my experiences. o-o

How can I see who's using it? I thought I had a PW, but that might have been my home network.

How can I see who's using it? I thought I had a PW, but that might have been my home network.

In my network, I have a wireless router, I can login into it, and see the attached devices

for me, it would usually show up to three computers, a PS3, or 1 of 5 DS's. or a mix of the said devices

If internet is crashing than start the computer and press F8 until you get to Advanced Boot Options.Select Safe Mode With Networking.Now take your browses for spin.Now you are able to upload file safely.