DK nRF52832 no longer works

Hello !

I'm currently working on a project using the DK Boards nRF52832.
I'm disappointed that one card no longer works ( doesn't light up). I therefore explain to you the tasks it performs. 
The card plays the role of a central. I'm currently using 6 peripherals. In the future, the objective of the project would be to use 100 peripherals and 1 central. In the initial state everything is initialized and the program waits for a command from the Uart. As soon as the central receives the command from the computer, it launches an RTC and it begins to scan and search for peripherals. Once it finds one, it performs the following tasks:
  • read the btid
  • discover services and characteristics
  • read the value ​​of 3 characteristics
  • send all data to computer via Uart
  • disconnects
It performs this loop for the 6 peripherals, it waits for 1 min, and then restarts its execution until it receives the Stop command from the computer. The execution can last 3 to 4 hours. 
Would that be a lot for one board? Could this be a reason for overheating and burnt out? 
Thanks for your help !
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