error 34 (0x22) GATT CONN LMP TIMEOUT in nrf connect app

Hello,

I'm using a custom board and i actually have a problem that I never saw before :error 34 (0x22) GATT CONN LMP TIMEOUT. 

I have send frames : I did my own custom board with an nrf52805

I'm trying to put a module with different frames, and when I do that my app is disconnecting 5seconds after. I

didn't have a problem for now with a com with a driver 485 but now that I'm putting it, I can't receive any info because I'm getting the error: error 34 (0x22) GATT CONN LMP TIMEOUT.  For info, I used the BLE_ app_uart example and changed so info to have the functionality to my custom board.

• <info> app_timer: RTC: initialized.
  <info> app: Debug logging for UART over RTT started.
  <info> app: Connected
  <info> app: Data len is set to 0xF4(244)
  <info> app: Disconnected
  

As you can see there is a disconnected device 

I'm going to show you what I have on the app NRF connect: 

Thank you