Add me to this list. I have this same issue with my U-Verse and ST Hub. It disconnects nightly now and wonāt come back without a reboot. I hope ST gets this resolved soon. Buying extra hardware to solve this is kind of self defeating, but, I appreciate the ideas as a work around. This issue makes it impossible for me to recommend the ST product to my friends that are not tech savvy at all. It is also killing my family buy-in on adopting this in my house!
Happened again this am, it would be nice to hear a update from ST.
Happens to me at will - if I reboot the cable modem (comcast) my V2 hub will go from green to blue while the modem is resyncing. Everything else comes back up fine. The V2 hub will stay āofflineā/blue until I press that reset button or cycle power. Every. Time.
Not hard to reproduce. Really shocking still no fix, but given the rest of the burning platform, this fire is probably pretty low on the list.
Simple workaround for pretty much anyone who can go to a web page. GIVE US A LOCAL WEB/REST INTERFACE TO THE HUB.
The problem lies with UVerse. Every time the broadband connection is down, the UVerse router automatically hijacks DNS queries and reports any domain name as pointing to 192.168.1.254 (the routerās default IP). It does this so that if you open any web page, it will automatically display an error page hosted within the router informing you about the broadband down situation. If ST attempts to reconnect during the broadband down time and it has been long enough since the last DNS query for STās servers, it will ask the DNS server for a the IP for ST and receive 192.168.1.254 as a response. At this point, it will keep trying to connect to the wrong IP for as long as the DNS record is set to expire (TTL). I still have a web page that wonāt open on my iPhone, keeps going to something like attdnserror.com (fake domain name that points to 192.168.1.254 within the UVerse home network)
Maybe a DNS flush before attempting to reconnect would fix this?! 
Or allow us to set a static IP and static DNS server on the hub?
Thank you,
Adrian
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WOW! After months of this issue I read @ady624 post and a light bulb clicked on for me and I fixed this. In the settings for the ATT UVerse NVG589 called āBroadband Status Notificationā if you turn this off the behavior described in @ady624 post above stops; e.g. the NVG589 doesnāt wipe out DNS on the ST hub.
Setting is under Diagnostics -> Event Notifications -> Broadband Status Notification. Just turn it off and save.
I tried this twice and my ST hub now back comes up almost instantly after the DSL connection is restored.
Iām so glad I ran across your post today!!
Itās not a fix for the ST hub but a very good workaround until ST fixes this.
Brad
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Glad I could help. Again 
And thank you for the tip, I found the setting in my Pace 5268AC router under:
Settings > System Info > Event Notifications
Adrian
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Thanks for the great tips! Configured it in my U-verse NVG599 Router
Diagnostics > Event Notifications
I un-checked āBroadband Status Notificationā and saved. I tested it by unplugging the router. The ST hub light turned Blue as the u-verse Router rebooted, and as soon as service was restored my ST hub was back on-line and the light on the front of the ST hub turned Greenā¦ It works !!! ā¦ Thanks !!!
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I have the same issue, I just tried your recommendation. Let me see if it works. Thanks
I have ATT internet, and ST v2 Hub. for the last two weeks, I am having the same problem 1-3 time per day. I have to unplug the power and push the reset button for 10 seconds until the light turns red. This all done from a ladder as my hub is mounted 9 feet up a wall. Since it is taking so long to get this fixed, is the issue beyond the scope of software?
Lourens, try logging into your AT&T router and disable the Broadband notifications, see the comments immediately above.
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Iāve only had my hub for a couple of weeks. After dealing with the U-Verse problem every day from day 2 on, I logged into my gateway and set the IP for the device so it was no longer DHCP. Itās been working for the last 7 days since then.
Does anyone know if the new firmware release on the 21st will address this issue for U-Verse customers?
Thanks for this. Iāve just changed my settings. 
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Iāve also changed mine, letās hope that it works. ARRIS NVG599
Not really, according to @slagle Try modifying your routerās settings and disable the Broadband Status Notification as described above.
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It does work, thanks
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Hi Adrian, Thanks for your reply. I tried the fix you recommended last night. Also ST sent me a notification below specifically addressing our issue.
=============
Hello,
Between 4:00 pm UTC (4/21) and 7:00 pm UTC (4/21), we will be automatically updating your Hub to the latest firmware. The update is expected to take less than 10 minutes, during which time your Hub will temporarily go offline.
The firmware update includes a fix to address some Hubs staying offline until a reboot, improvements to ZigBee device pairing, improvements to LAN-based device connectivity, and fixes to address issues with SmartApp execution when using a large number of devices.
Thank you,
SmartThings Support
=============
Lourens
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Looks like the update fixed the issue on my Arris NVG599
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Thatās great. Iāll have to do further testing when I get home, but I believe that changing the settings in my AT&T modem also fixed a problem I was having with my TV and harmony remote so Iāll probably leave that setting on the modem. Hopefully everything stays fixed now.
Just noticed my Hub has been offline since 4/20. Same AT&T UVerse issue everyone has been seeing. Iām assuming I missed the firmware update. Will I get the update once my Hub gets back online? Or do I have to wait for the next update? Anyway to manually get the firmware update?