nrf_delay_us() and ble connection question

[cabin]

HI

softdvice : s132 

SDK version : nRF5_SDK_17.1.0_ddde560

I am using the nrf_delay_us() function.
The product I am using now controls the gpio in us units. Since it is a product that affects even 1us, I have the following question.
There is a problem with the nrf_delay_us() function intermittently delaying.
However, the problem seems to be a problem with the BLE connection status (connection interval). If I disconnect the BLE, the problem does not occur.
Could the nrf_delay_us() function be affected by the signal that periodically checks the connection? If so, is there a way to solve this problem?

BR

Cabin

[Susheel Nuguru]

Please read the documentation for softdevice interrupt model to understand the priorities in which softdevice operate and contexts in which BLE interrupts have higher priority than application.