E403 Error on AT&T Gateway Receiver Display

I have been already been trying the Internet Air customer service department support system. Get sent links to unrelated information (like DVR receiver) or get told to reset Gateway which I am getting tired of doing. 

We understand you, and glad to assist @Bajad!

They are the experts in Internet Air, so we recommend that you reach out to Internet Air customer support department at 800.288.2020 as they are the best to assist. They are available from Monday through Friday, 8:00 a.m. to 7:00 p.m. Saturday & Sunday, 8:00 a.m. to 6:00 p.m.

Let us know how it goes.

FionaA, AT&T Community Forum Specialist

Issue Update: According to the AT&T error page..."This error means there was an authentication failure with the 5G or LTE network." and I am to:

1) Check for wireless outages.

2) Improve the hub location.

3) Restart the hub.

4) Contact them. 

No outages found on site right now but this is after the events, I will try during next issue. I will also look for a higher location for the hub, however cell phone shows three bars already in the existing location.

I wonder if this is a tower bandwidth issue and when cell traffic gets heavy the Internet service is cut down or goes off?

I am having the same issue, and customer support's advice is to restart my gateway and/or my devices. I've been on hold for over an hour 3 separate times, and most recently, the agent hung up on me. I've never had such an unreliable product. I currently haven't had reliable internet in 2-3 weeks and I work from home, so this is honestly unacceptable. Please advise me on how best to continue. 

One thing that we noticed is that the Cell Phone's hot spot seems to work OK when the Air hub goes off so we switch over. Also the Air hub tends to go off at the same times in the evening. 

No changes made yet hub has started working with no error codes. It has been three weeks now...fingers crossed.

Hub has been working great as far as connections and no errors. Looks like issue has gone away. Now if I can get the Youtube TV IP address local channel location issue resolved internet life would be perfect. Keeps changing to LA or San Francisco local channels then eventually back to San Diego's.

New Internet Air customer, Denver area, also getting E403 errors almost daily since installation.  Resetting the All Fi device per AT&T's troubleshooting instructions always resolves, for a while.  No useful information in the Smart Home Manager app to help, i.e. to deduce if my signal is weak or something, but no reason to think that's it.  I'm very close to the tower, and get blazing speeds after each reset.  But speed degrades over time and, if I don't reset the router proactively, I'll eventually get the E403 error again.  Hoping AT&T is aware and working to alleviate this recurring problem.  

My system is still working reliably after 2 months now...no more errors. I made no changes on our end to affect this. I suspect this issue was due to the local tower's bandwidth limitations and shutdown of the Air Internet system to ensure supporting the cell phone traffic. Likely made upgrades for better support of their Internet system.