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nrf52840 , android disconnect after 28 seconds of connection

hi ,

I have a project with sdk14.2 nrf52832. It works well, it can broadcast, it can connect, everything is fine.

But I have a new project that requires nrf52840. My chip is 52840 QIAAC0. It only supports sdk15.0.

So I first tried to change the original project to NRF52840, which supports sdk15.0.

The transplant went well, broadcasting on 52840. But something strange happens when I connect to my phone.

It will disconnect after about 25 seconds. But it's the mobile phone that's actively disconnected. And 52840 re-enter broadcast mode.

I get the logger from sniffer.I found out that BLE's communication with mobile phones suddenly stopped. 

There was no communication for ten seconds, so the phone was disconnected.

I don't know why . Can you analyze the problem? how to solve problem?

sr3 lmp disconnet log01.pcapng

BR

Judge

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