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nRF52 DK running ble_app_uart_c disconnects 6 seconds after connecting to peripheral error code: 0x08

We have an nRF52 DK system running ble_app_uart_c example code and communicating with a peripheral device.  We setup a second development system using another nRF52 DK system running the exact same code as the first system but after about 6 seconds after a connection we get a timeout error 0x08 and it disconnects.  

I've tried changing the clock accuracy settings as you describe above but no effect. 

<info> app: Connected to device with Nordic UART Service.
<info> app: Disconnected.
<info> app: Disconnected. conn_handle: 0x0, reason: 0x8
<info> app: Connecting to target 520822071920
<info> app: ATT MTU exchange completed.
<info> app: Ble NUS max data length set to 0x14(20)
<info> app: Discovery complete.
<info> app: Connected to device with Nordic UART Service.
<info> app: Disconnected.
<info> app: Disconnected. conn_handle: 0x0, reason: 0x8
<info> app: Connecting to target 520822071920
<info> app: ATT MTU exchange completed.
<info> app: Ble NUS max data length set to 0x14(20)
<info> app: Discovery complete.
<info> app: Connected to device with Nordic UART Service.
<info> app: Disconnected.
<info> app: Disconnected. conn_handle: 0x0, reason: 0x8

You can see from the debug window that we are stuck in this loop.

We are also running the exact same development configuration on both systems:

SDK 15.3

Segger SES V 4.10

nRF DK PCA 10040

Please advise.