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Compiler/TMS320F28069: F28069 Illegal_ISR()

Part Number: TMS320F28069

Tool/software: TI C/C++ Compiler

Hello,
customer has a problem running sometimes into ITRAP on a TMS320F28069. As it is only sometimes it is not sure if it is a compiler problem. I can send you the SW project TI internal.

Problem:
The code is running into Illegal_Isr after ca. 700ms. The problem is located with the „Timer_ISR()“.

The „Timer_ISR()“ is running from „RAML0+RAML1“. If it runs from Flash or from “RAML5” the code runs stable.

Setup:

- Compiler v6.4.2

Can you have a look into this?

Regards, Holger