Int'l Note with Straight Talk BYOD - how STABLE is your DATA connection?

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A quick background:
- I have an International Note - factory unlocked
- I signed up with Straight Talk few days ago - ordered the AT&T SIM Card
- Voice, text messaging and MMS works
- I am in Northern California

Problem is, the data connection is very UNSTABLE. I will have full bar, can browse the web and then.... BOOM! Suddenly no data, even though my phone show 3G and full bar. The only fix? Turn ON Airplane Mode, Turn it OFF or REBOOT, which is clunky and time consuming at best, especially when you are out and about.

This is not just an annoyance, but makes the phone almost unusable since I need data for my Exchange email, Google Navigation, etc. I DO NOT use the Note for tethering.

My APN is as folllow:
APN 1...
Name: Internet
APN: att.mvno
APN type: internet
APN type: default

APN 2...
Name: MMS
APN: att.mvno
MMSC: http://mmsc.cingular.com
MMS proxy: proxy.mvno.tracfone.com
MMS port: 80
APN type: mms

Fast Dormancy: Disabled

For those who use Straight Talk, could you tell me:
1). If you experiences the above
2). Where you are at
3). What APN do you use
4). Do you enable "Fast Dormancy"?

I am trying to figure it out if this is my Note or just ST flaking in my area.