TMS320F280039C: Why the flashapi will enter NMI with Floating Point mode strict?

The explanation of relaxed vs strict can be found in section 2.3.3 of the compiler user's guide:

https://dev.ti.com/tirex/explore/node?node=A__AGX-cvOOd8TtvuQMTMIB7Q__CCSTUDIO-ACADEMY__RdkYJ-M__LATEST

As for: 

Anka Zhang said:

My customer flashapi enter the NMI. When they turn the Floating Point mode from strict to relaxed and the flashapi works well.

This is best explained by the device experts.

Thanks

ki