If your device received the update but didn't successfully install it, a fix is on the way. There's no official word as to when it will be available, but they're shooting for sometime next week
Looks like Sprint started pushing a small OTA update to the Samsung Epic 4G Touch that fixes a couple of quirky issues:
- 4G Sprint Hotspot disconnects when in a phone call
- Radio loses signal and may require power cycle
The update is rolling out in stages and will hit all devices within the next 10 days. To see if the update is available on your device, head into Settings > About phone > Software Update.
[Sprint Community Forums]
Thanks Mike and Anthony!