periodic disconnect when nRF52 central

[Mikhail]

Connect establish with smartfone in peripherial mode. SDK13. S132. Periodic I observe disconnect, than 2-3 advertise packet and new connect again. Where can I see what reason of those disconnect? And how to fix it?

[endnode]

If mobile device (Android?:) is GAP Central you can easily experience bugs in low-level BLE stack, there are thousands of devices and order of magnitude more bugs... If you really want to spend your time with that one device (unless you see the same problem with many others including some well-known reference devices like big-brands' flag ships) then you need to make some BLE trace with sniffer, probably many of them and probably with more expensive device then just Nordic sniffer (but you can start with it and maybe you get lucky).