Your program may have interfered with the communication routine. Please check the following:
1) You did not run the commands such as OUTCOMM, PRINT, NETCMD, READMODBUS, WRITEMODBUS, READMB2, WRITEMB2 on the same COMM port that is used for online monitoring.
2) You did not have a lot of LOAD_EEP or SAVE_EEP command. On the T100MD888 the system interrupt is shut off during the EEPROM read/write routine and if you have continous access to the EEP then it will affect the communication badly. Use these command sparingly usually during start up or shut down of the system.