there's a thread on XDA about a press release about random shut down.
At&t captivate shut down press release - xda-developers
Date Published: December 20, 2010
Manufacturer(s): Samsung
Model(s): i897 (Captivate)
Issue Type: Informational
Issue Summary
AT&T and Samsung are working together on a power off issue on the Samsung i897 Captivate. There is a small group of Samsung i897 Captivate devices which may experience power off when in standby mode. All devices manufactured after November 6, 2010 should not have this issue. Most customers are not expected to see an issue, however the following IMEI range could potentially have the issue and AT&T and Samsung want to ensure these customers have the best possible experience and quickly address customer care inquiries should they arise:
IMEIs manufactured before November 6, 2010: 352982040855394 or lower - 5393, 5392, etc.
If customers reports that their device is powering off when in standby mode please assist them with exchanging their device.
SKU: 65187
Critical Must Know/Must Do
Customer/Embedded Base: If a customer has the power off issue when in standby mode please exchange their device. Customers with the launch software version i897UCJF6 are more apt to have the standby power off issue. Meanwhile customers that have devices manufactured after November 6, 2010 should have software version i897UCJH7 which fixes the Power Cycling related to SW issues.
Existing Product: All devices that were manufactured before November 6, 2010 have the potential to be affected.
New Product: Devices manufactured after November 6, 2010 should not experience this issue.
Distribution Center: No action necessary.
Channel Instructions
Company Owned Retail: Continue to sell through existing inventory. If a customer has the power off issue when in standby mode please exchange their device.
Dealers: No action necessary.
National Retail: No action necessary.
Direct Fulfillment: Continue to sell through existing inventory. If a customer has the power off issue when in standby mode please exchange their device.
Customer Returns and Exchanges: Standard under 30-day returns are in effect for this issue.
Accountability/Responsibility
Distribution Centers: No action necessary.
Channels/Markets: Adhere to Standard Operating Procedures.
Returns Processing Center: Adhere to Standard Returns Processes.
Supply Chain: Please send questions or comments to SCM Product Advisory.