My internet is slow and keeps disconnecting How do I fix it?

I have DSL internet with netgear router, this is password protected, my internet works great between midnight and 8 am, however it constantly knocks me off and runs really slow during the day when I use it the most. this has only been since we moved into our new home. it happens on both the desk top which is wired to the router and the laptop where I use wireless. I called my internet provider, they said that my phone wire was too long, so I bought a shorter one and still experience these issues. I should also point out that my laptop works fine at school and recently on vacation it worked amazingly well, so I dont think its in the computer. any suggestions? this is making me crazy!