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a question about external trigger in the lightcrafter4500

Other Parts Discussed in Thread: DLPC350
Hello TI
a question about external trigger in the lightcrafter4500 
Hardware : lightcrafter4500
Operation mode : Pattern from flash
Software firmware : TI 4.03
GUI :3.10
1、add frist pattern ,
A、External trigger
B、flash Index 0,8bits,G0-G7,white solid
C、Pattern Exposure time : 8400uS、Pattern Period time=10000uS
2、add Second pattern
A、Internal trigger
B、flash Index 0,8bits,R0-R7,white solid
C、Pattern Exposure time : 8400uS、Pattern Period time=10000uS
3、add third pattern
A、Internal trigger
B、flash Index 0,8bits,B0-B7,white solid
C、Pattern Exposure time : 8400uS、Pattern Period time=10000uS
6、send 、 Validate and play
4、mcu sends trigger signal to  TRIG1_IN_CON at J11  and trigger is 3.3V from MSP430 mcu gpio
5、tested : first trigger,OK
A、blue line is trigger signal detected from J11 
B、yellow line is Photodiode sensor detected from output optical power
6、Second trigger :ERROR
A、Just had trigger signal but no optical signal (had not displayed picture)
7、Thrid trigger:well done as first trigger
8、Fourth trigger : had not projected as second trigger
9、Cycle in turn, Interval time 2s each trigger 
Why????????????????????????????
Then , changed Pattern Exposure time = Pattern Period time=10000uS (8333<any value ), tested、all is well 
can you tell me why
Thank you for any help
Best Regards
Jia