Scan Callback is not Called

HI.

Environment : ncs v3.0.1, nRF54l15 DK

I have a project to use Multi Role of BLE.

peripheral advertise 300ms period.

central scan 2m 30s period. ( actual scan is about 10s, Scan Param Interval 50ms, window 25ms //  scan 10s, sleep 140s scan 10s ...)

scan start ,stop function is executed user Thread(priority 7)

sometime after 1~3 days(I don't know exactly Time), scan Callback is not called.

it means that the function bt_le_scan_start, bt_le_scan_stop is success, but callback is not called. after starting callback is not called, callback is not called forever.

First I thought some collision advertising and scanning, however it is weird that not calling callback is continuous.

1. the reason is advertising and scanning collision?

2. is any solution?

thank you.

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