Are you saying that the HBO go app on your ipad has been working fine. And now it isnt?
In that case heres what we need to do.
Delete the HBO Go app.. Once deleted, perform this reset.
Hold down the sleep / wake and home button for about 15 seconds, or until it asks you to turn off the ipad. Turn it off, then turn it back on.
Then download and install the HBO go app again from here.
Once installed, you should be able to sign into your account and watch HBO again.
If you get stuck or run into any issues, let me know.
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Senior Technician and Network Switching Systems Operator / Maintainer.