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ST-Link Connection Error after Every Successful Flash Download

Question asked by JJ on Nov 6, 2015
Latest reply on Nov 6, 2015 by Clive One
I'm using Keil uvision(on windows 7 as well as windows 8.1) to implement ADC & DAC functions on STM32F4-Discovery board. 
After my last trial, "ST-Link Connection Error" occurred and ever since, I need to do a "full-chip erase" using ST-Link Utility after every flash download to the STM32F4-Discovery board.
I have tried with many different programs(codes) to see if the connection error is caused by the programs. However, after each flash download, the same error appears and I have to do full-chip erase to load another program.
I'm really frustrated because of this and I'd really appreciate it if somebody could help. Peace :)