Loss a IRB route on EX switch

Hi 

I found a problem on my switch on last week. I have 5 unit of EX4300 within mix virtual chassis. version is 14.1X53-D30.3  All IRB route is not shown in routing table. I have to reboot it after that It will show again. 

I try to get a log message it. Output as attached. There was a interesting in one log message.

"PYH-FL17-EX4300-Core chassisd[1184]: CHASSISD_IPC_FLUSH_ERROR: ch_flush_fru_pipe: flush operation failed for LCD 4" 
PYH-FL17-EX4300-Core chassisd[1184]: CHASSISD_FRU_IPC_WRITE_ERROR: fru_send_msg: FRU LCD 4, errno 40, Message too long"

Have you ever seen these log messeage??

Thanks!