Question [Q] For SM-N9005 unlocked owners using US AT&T network - data stopped working

I had this weird problem where mobile data stopped working on my Note 3. The last time it worked was Saturday evening and when I got home, got on wi-fi. This morning, I left the house and I got just the bars without the usual H+ along with it. Phone status said that the network state was disconnected. However, calls worked fine. I tried to troubleshoot with the ATT rep, tried re-registering my number multiple times to no avail. Then, I went into network mode and switched it to "WCDMA/GSM auto" from the default "LTE/WCDMA/GSM auto", and data works again. Since I always had the phone on "LTE/WCDMA/GSM auto" and I know I didn't do any system updates lately, some recent change in the ATT network was probably not playing nice with that network mode. Has anyone with the int'l Note 3 on the ATT network had this problem?