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TMS320F28379D: trouble some times when run code on TMS320F28379D experiment kit

Part Number: TMS320F28379D

C28xx_CPU1: Trouble Halting Target CPU: (Error -1138 @ 0x6) Device refused to allow debug mode. Power-cycle the board. If error persists, confirm configuration and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 6.0.407.3) 
C28xx_CPU1: Error: (Error -1141 @ 0x0) Device is not responding to the request. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 6.0.407.3) 
C28xx_CPU1: Unable to determine target status after 20 attempts
C28xx_CPU1: Failed to remove the debug state from the target before disconnecting. There may still be breakpoint op-codes embedded in program memory. It is recommended that you reset the emulator before you connect and reload your program before you continue debugging
C28xx_CPU1: GEL: Error while executing OnTargetConnect(): Could not write 0x0005F412@Data: target is not connected
at *((int *) 0x5F412)=0x000F [f28379d_cpu1.gel:80]
at OnTargetConnect()

my code is run properly for some time, in between i editing in code and debugging continuously and check my wave form on DSO.

this things are going properly 3-4 times and after that suddenly above error massage is coming. i have to do "on off" switch, which is given on experiment kit .

Plz give me some solution for above things as soon as possible.