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Android devices lose bonding

Hi,

we've developed a custom board with nrf51 and use bonding and white listing.

Everything works fine when connecting and bonding iOS phones with this devices but with Android things are a bit more difficult.

Somehow after bonding certain Android devices forget this bond after hours, days or weeks and are then unable to connect to our device again. They can get past the white listing since they are still recognized by the nrf but then they are unable to authenticate.

We've had this problem so far with different Motorola and Huawei devices. Is there any solution to fix this within Android?

If not I guess the only solution would be to allow the smartphone to bond again but of course this would be a security issue.

Thanks for your help

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