what is the problem? programing halt

[David.Cheng]

08:49:24 : V2J17S4

08:49:24 : Connected via SWD.

08:49:24 : Connection mode : Normal.

08:49:24 : Debug in Low Power mode enabled.

08:49:25 : Device ID:0x410

08:49:25 : Device flash Size : 64KBytes

08:49:25 : Device family :STM32F10xx Medium-density

08:54:32 : Error occured during flash mass erase!

08:58:43 : Disconnected from device.

08:58:43 : Connection to device is lost: check power supply and debug connection.

[Tesla DeLorean]

Lacking any contextual detail.

Probably conflicting with prehistoric firmware on the ST-LINK, perhaps try updating that first.

Some custom board? Could perhaps have issues with flash if power supply inadequate.

[David.Cheng]

yes custom board, power supply should be enough , after we replaced a MCU , then no issue

only one out of 300 happened