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nRF51822 stops advertising after few hours

Hello,

I can't solved a problem with advertising problem on my iBeacon working on nRF51822.

I have my own 40 unity BLE Module in my room test. They're configured to advertise and broadcast iBeacon parameters every 100ms.

I'm changing dynamically value of major every 3sec. Command of changing major is sended through SPI by another microcontroller. This value is changing well because I see it by listening advertising by nRF Master App.

After an advertising during 4,5 hours of each nRF51822, few of them stop advertising (I can't see them by nRF Master App). Every next hours/minutes, new ones stop advertising. After 3 days, 80% of nRF51822 are not advertising.

When one is stopping to advertise, it will never advertise again before I restart it.

When I restart all nRF51822, they came back untill few hours of working.

Do you have an idea what it can be ?

Best,

Paul

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