Hi dear friend,
I have exactly the same FM458 as you, which keeps stopping continuously with the following error:

Event 20 of 100: Event ID 16# 6523
Memory reset request due to error accessing memory submodule
No relevance for user (Z2): 8080 (Z3): 5411

I wanted to ask whether, after replacing the MMC card, you’ve had no further issues during the past three years and if the problem was completely resolved?

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Split from 458-1 is frequently stopping.