Toshiba's update to fix the "sleep/resume issues" for some users of their Thrive Tablet is now available. You can get the update via the Thrive's "Service Station" app. Here's the quote from Toshiba themselves,
It would be nice if human sleeping disorders could be solved with a simple "software/firmware" upgrade...A limited number of Thrive Tablet users have experienced a Resume issue when in Sleep mode. Toshiba has released a software update to resolve this issue, improving the sleep-and-resume performance, as well as enhancing the multimedia playback capabilities of the device. The software update can be downloaded through the Toshiba Service Station utility app found on the Thrive Tablet.
Source: ThriveForums.org via AndroidCentral