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MSP430F5342: Errata CPU40

Part Number: MSP430F5342

Dear TI experts,

I am using MSP4305342 and have some strange problems.

I have 50pcs boards,there are two boards run into the unexpected funtion which locates at code segement 0x22400.

This function is doing some "flash erase" and "flash write".

I can ensure that this function has only one entrance,before this function entering,address 0x22C00 will have some label like "0xA5A5" .

Finally,This funtion entered without the label "0xA5A5",so I can ensure that this function is entered by accident.

According to the slaz278ab,errata CPU40 is the only CPU errata will happen on MSP430F5342 with IAR FOR MSP430 V6.40.

So I wonder that if my code touches errata CPU40.

My questions are:

1.What wiil cause errata CPU40?I cannot understand clearly through slaz278ab :(

2.How can I solve errata CPU40?According to the slaz278ab,add some command line would sove.However,when I add these command line,there is nothing changed with my ".bin".