Program Mainwindows exits but still working in Background

i have been facing this issues for multiple times

after i run the program for long period of time, the windows will gone and still runs in background(showed in Task Manager), and some function still working.

Over last night, i checked my bot this morning, it was running against wall and wondering around, ( i was told it to bot BGs)

and not queue up for BGs.

Talking about "the disappear of window", everything after i launch the bot between the Main windows pops up, during that time, if i click anything beside this program, the main bot will appear in backkground(only be able to tell in TaskManager).

i am using Windows 8 64bit

latest wow