nRF5340 - program lost

[Gabriele]

Hi,
A couple of customers have returned the product back after a month of regular use.
The nRF5340 had lost the internal program.
Has anybody else experienced the same with the nRF5340 ?
Is there any means to diminish the chance of such occurrence ?

Some device's info:
Chip variant 0x41414141
Chip config 0x112
Chip id: 0x6687373ca7d1fa21

[mtsunstrum]

We are in the midst of developing a product on nRF5340 and had a similar customer report this week.

From my customer, it sounds like it occurred when they let the LiPo battery drain. Once it reaches about 3.0V, the LiPo battery PCM circuit would effectively do a hard shutdown of the device, including the nRF5340

We are working to repeat and/or extract the flash file contents to understand better.

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As mentioned, we are in the midst of developing the product, so glad we observed it at this stage.

It is surprising. In the customer's state, the nRF5340 was running some algorithms, but none of our application would be doing flash write operations at that time. So a flash corruption may not be expected.

I'll dig further into Nordic documentation about shutdown scenarios as such.

We do monitor our battery level, so we could "hibernate" appropriately, if that would help in this scenario.