My At&t 2wire router is very slow?

The average speed of the router is only 30 mbps and sometimes, the speed drops below 20 mbps. At that point, I can do almost nothing online.
I get this message all the time that says the router "broadband link error" and after a minute or so, it tells me I have to close all tabs and reopen internet explorer because the problem is fixed.

I know these devices are being very slow:
Iphone 3, 4, 4s,
ipod 3rd gen
Macintosh (Not sure of the model)
Dell inspiron laptop

Get a computer technician to help you with this, I have the same problem. Try not to use the internet on more than 2 things at a time, so you have faster internet. Also, you might want to use something other than Internet Explorer, try something like Firefox or Google Chrome. Hope this helpo\s.

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