Internet dial-up, now of problems on Macbook Air only service

I am running OS X El Capitan 10.11.2 on a MacBook Air.  We used to have AT & T pays U, and I never had any problems.  Now we have Time Warner and it seems to work fine on all our appliances (including MacBook Pro my husband) but on my cell every hour or two my internet no longer works and I have to disable wifi then turn it back on and happens to work again.  The indicator never stops showing a sign strong, but I lose all the features of the Internet periodically.  Does anyone have an idea what could be the problem?

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1. turn off the power to the router. Unplug it from the wall. Wait a while.

Plug it in, back to the wall. Turn on the router. Wait for all lights are light up properly. It will take a while.

Restart the computer.

Boot mode safe.

https://support.Apple.com/kb/PH18760?locale=en_US

2. If this does not help, please contact support for Time Warner.

Tags: Notebooks

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