Device runs wrong after goto sleep on awhilehttps://devzone.nordicsemi.com/f/nordic-q-a/59714/device-runs-wrong-after-goto-sleep-on-awhileHi every one, I&#39;m a development product with chipset NRF52811, using soft device S112 and SDK 15.3.0. My device will wake up and send data whenever I press the button or one-timer interrupt every 30 minutes. Everything run is fine when startup anden-USTelligent Community 13Wed, 01 Apr 2020 13:47:13 GMTRE: Device runs wrong after goto sleep on awhilehttps://devzone.nordicsemi.com/thread/242992?ContentTypeID=1Wed, 01 Apr 2020 13:47:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:313f3b17-1f53-416e-baa9-c37a2504e79bEinar Thorsrud<p>Hi,</p> <p>According to the <a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s112.api.v6.1.1/group___b_l_e___g_a_t_t_s___f_u_n_c_t_i_o_n_s.html?cp=4_6_0_2_2_4_2_3#gacb80e44fb1309fe388c6baf747f6f994">API documentation</a>, sd_ble_gatts_exchange_mtu_reply() function will return&nbsp;NRF_ERROR_INVALID_STATE if &quot;<em>Invalid Connection State or no ATT_MTU exchange request pending</em>&quot;. Have you checked (for instance by adding more logging) which of this is the case when it fails in your application?</p><div style="clear:both;"></div>