My Macbook Pro suddenly won't stay connected to the internet.

My Macbook Pro recently has had problems staying connected to the Internet. Our other Macbook Pro is having the same problems. I have already spoken with with our ISP, AT&T. After trying several things, they said that it may have to do with Safari and that they couldn't suggest any settings changes to our browser because it might disqualify any warranties that we have on our Notebook if another company makes changes to it. I've spent hours and hours trying to resolve this and it's driving me nuts. Also my wireless HP Printer won't stay connected either. Not long ago AT&T sent us a new modem/router (all-in-one), that is why I called AT&T to see if it was the new modem. But come to think of it, I had called AT&T because of this connectivity issue and now I'm thinking that it wasn't them at all. Maybe it has to do with Apple. I'm a Apple lover, so please help!!!

Also my wireless HP Printer won't stay connected either.
Does that mean it won't stay connected to the network, or it's not reachable from your Mac? There's a difference.

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