nRF52840 DK stops to scan after 3 hours working

[qwertynoon]

Help me please!!!

nRF52840 DK stops to scan after 3 hours working.

Project is based on central_nordic_uart_service.

Scan params

    struct bt_le_scan_param scan_param = {
        .type     = BT_SCAN_TYPE_SCAN_ACTIVE,
	.interval = 220,
	.window   = 80,
	.options  = BT_LE_SCAN_OPT_CODED | BT_LE_SCAN_OPT_NO_1M
    };

    struct bt_le_conn_param conn_param = {
        .interval_min = 1000,
        .interval_max = 1000,
        .latency = 0,
        .timeout = 2000,
    };

    struct bt_scan_init_param scan_init = {
        .connect_if_match = 0,
	.scan_param = &scan_param,
	.conn_param = &conn_param
    };

    bt_scan_init(&scan_init);
    bt_scan_cb_register(&scan_cb);

    err = bt_scan_filter_add(BT_SCAN_FILTER_TYPE_UUID, BT_UUID_NUS_SERVICE);
    if (err) 
    {
        LOG_ERR("Scanning filters cannot be set (err %d)", err);
        return err;
    }

    err = bt_scan_filter_enable(BT_SCAN_UUID_FILTER, false);
    if (err) 
    {
        LOG_ERR("Filters cannot be turned on (err %d)", err);
        return err;
    }

    LOG_INF("Scan module initialized");
    return err;

it works fine 3 hours and then BLE doesn`t able to scan any peripheral.

Connected devices are working fine until it disconected, and then they can not to connect - no any feedback on central side.

I tried to reinit, start, stop scan - nothing helped.