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Sudden "ACTION GATT DISCONNECTED" problem

Dear Experts,

I am developing SimpleBLEPeriphereal device.

It downloads big size of data file such as 100KB.

The problem is.. it works OK but during the download, it gives me "ACTION GATT DISCONNECTED".

And then, of course downloading is stopped.

The stopping position is not specific. Sometimes it stops right after download start, and sometimes it stops after quite a while.

Can you guess why?

I am desperate. Please help me.

Thanks.

YS