Unexpected error from app_error_handler

Question

Hi, I have developed the custom services for nrf52832 with sdk16 in SES 
 in write character 
 Sometimes the write option works fine 
 unexpected error after write function and system get hanged 
 while i debug the nrf52832. 
 I received error state like 
 
 and in nrf connect show 
 ERROR8(0x8) gatt conn timeout 
 ERROR 133(0x85) gatt error 
 
 suggest me to overcome this error

Sunil vignesh · Accepted Answer

Hi Hung, Still I got this error. is there any solution. 
 Actual state is. 
 The Device is getting Hang is these following cases 
 My device is custom board have one user button, Accelrometer and gyroscope sensor 
 SDK 15.3 with DFU bootloader 
 The user button have multiple concept single press to ON , single press to change mode, Double press to calibrate sensor, and Long press to Sleep mode 
 and In sensor side the raw data read from the sensor through I2C and send it to Bluetooth connected device (Mobile phone ). for every 250 ms . 
 
 Problem here 
 1. while Bluetooth connected to the mobile device if the connection fails or mislead with other Bluetooth devices already connected with mobile phones. that leads my device to HANG 
 
 2. when multiple times of pressing the button to calibrate the sensor repetitive five times device got hang 
 Does the error is because of Timer interrupt ? previous is showed you the error image. please check in previous conversation

Unexpected error from app_error_handler

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