Internet Crashing

My internet will just crash every minutes to sometimes seconds and the crashing only last about 10 seconds. It really gets annoying. its been happening for a couple months now and I have no idea how to fix it. I'm using cable and it seems to only happen to me in the house my brothers laptop isn't affected by the crashing, if anybody knows how to fix the problem please tell me.
EDIT oh and it happens randomly like say its could crash one day then it wont crash the next day. Or it could crash for one hour and not crash for the next 3 hours.
 
I'm using cable and it seems to only happen to me in the house my brothers laptop isn't affected by the crashing,
I guess you are saying that at your house, your Internet connection has problems but your brother's laptop does not.
Crashing(what: your system versus your browser) or Disconnecting?
 
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