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Reset problem on STM32F401 discovery board

Question asked by ER on Oct 6, 2015
Latest reply on Oct 6, 2015 by ER
I have a new STM32F401 discovery board, but the on-board ST-LINK stops responding only after a few programming. It shows "internal command error". I have to press the reset button when I want to program/debug the code (for ST-LINK to recognize the board), and then have to release the button on-time to let it proceed to program/debug. So I guess the problem has something to do with resetting. I can connect and program the board through "STM32 ST-LINK Utility" software without difficulties. After a full chip-wide erase, the "internal command error" problem exists. So I think the problem is more related to ST-LINK side. I am using Keil 5. 

How can I solve this problem?