nRF52832 connection problem with some android device

Question

Hi,
I'm using nRF52832 with sdk 13.0.0(softdevice 4.0.2).
I had trouble to connect nRF52 and some android 7.0(or upper version) smart device.
I tested samsung galaxy tap 10.1 A6 (android 7.0) and LG V20(android 7.0).
When I connect by nRF Connect application, I got "Error (0x8) GATT CONN TIMEOUT" message.
But, another smart device(nexus 5X, samsung galaxy s8)is work well.
Has anyone ever happened to this? 
 Thanks,
Regards
Youngjun.

Hung Bui · Accepted Answer

Are you sure it's reason 42 = 0x2A = BLE_HCI_DIFFERENT_TRANSACTION_COLLISION ?
It's a pretty strange disconnection reason, I haven't seen it before. Maybe you want to add a break point in BLE_GAP_EVT_DISCONNECTED event and check ? 
 You also may want to have a look at this case and this similar case . 
 Not sure if it's the same issue, if you can capture a sniffer trace, it would be clearer.

nRF52832 connection problem with some android device

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