https://devzone.nordicsemi.com/f/nordic-q-a/12124/ble-disconnect-issueHi all, We are using nRF51822-QFAA-R7 to develop our HUD system. The BLE connection is not stable some time. For most iphone 6/6s, the BLE can connect for a short time (1-2s) and disconnect and reconnect for (1-2s). We tested one iphone 5 anden-USTelligent Community 13Mon, 29 Feb 2016 12:20:21 GMThttps://devzone.nordicsemi.com/thread/45868?ContentTypeID=1Mon, 29 Feb 2016 12:20:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0caa2fc6-8d70-4e36-a811-a9b6bd44cb03run_ar<p>Are you basing your code on an SDK example? What disconnect reason do you get on the nRF51?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/45867?ContentTypeID=1Fri, 26 Feb 2016 09:23:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2311da82-c4bf-43ab-bb71-9a2d5e96f18cPeng<p>The load capacitors were 7pf, I did changed them to 15pf today, but status is still the same...</p> <p>I was using lightblue to test the device, the BLE connection can be found by iphone, and the request to pair window pops up, if I don&#39;t click the pair button, the device can still transfer data to the iphone. After I click the button, after 4-5 second, a window will pop up and shows that &quot;Disconnected Alert&quot;, and the status will be &quot;Disconnected. Data is Stale&quot;</p> <p>We don&#39;t have 32KHz source in the design.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/45866?ContentTypeID=1Thu, 25 Feb 2016 15:21:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5dd972b6-cf90-496b-bedd-5e4d8179f276run_ar<p>What is the size of your load capacitors?</p> <p>And do you know what the disconnect reason is? Connection timeout?</p> <p>What is your 32KHz source?</p><div style="clear:both;"></div>