You cannot purchase a device to replacethe 3801. You probably could get AT&T to send you a gateway to replace it, which may be another 3801 or some other model, which may be better, or it may have some different issues you wouldn't like.
Another alternative is to purchase a router that you would install in combination with the 3801. It could either just provide Wireless coverage for you, or it could take over some of the routing duties, which may improve your experience. It really depends on what is actually causing your particular issues.
You might want to look at the diagnostics page on your 3801 (http://192.168.1.254/ , click on the Broadband tab and look for the tables that have sync rate, attenuation, SNR and error counts). If you'll take a screenshot and put it in a reply to this thread, we can take a look at it and give you our opinion about whether you're having line issues that may be causing some of your slowness.
Award for Community Excellence 2019 Achiever* *The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.
Please NO SD stretch-o-vision or 480 SD HD Channels Need Help? PMATT Uverse Care(all service problems) ATT Customer Care(billing and all other problems) Your Results May Vary, In My Humble Opinion I Call It Like I See It, Simply a U-verse user, nothing more