https://devzone.nordicsemi.com/f/nordic-q-a/124626/usb-disconnection-using-cdc-acm-os-error-22-on-nrf534Hello all, I&#39;m currently developing some test FW for our custom hardware which include a nRF5340 and nRF7002, I made a small program to test the the different power supply via UART command to enable/disable GPIO. For some reason my UART communicationen-USTelligent Community 13Tue, 30 Sep 2025 13:42:54 GMThttps://devzone.nordicsemi.com/thread/550204?ContentTypeID=1Tue, 30 Sep 2025 13:42:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ac00aa4c-89b5-47c8-9c49-5d4a320aa901ValentinKunti<p>Hello, thank you for your response, I just found the issue was with our hardware and a reset on the USB side (we have a reset system which induce a reset when we have a small voltage drop on VBUS) ! <br /><br />sorry for the inconvenience !&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/550175?ContentTypeID=1Tue, 30 Sep 2025 12:32:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:20847d75-08c2-42c6-9987-af7902c31b13Asbj&#248;rn<div>Hello Valentin,</div> <div></div> <div>Based on the description here and your observations, if there&#39;s a failure about 30seconds into the FW every time, it is often related to buffers becoming full or sudden remapping of GPIOs in FW unintentionally.&nbsp;</div> <div></div> <div>The four lines of uart print, is that all you see across the 30 seconds? Is this as expected for your test? The switching between power supplies you are attempting, is that happening and is it reaching the same place in the FW every time around 30 second mark, e.g. is it failing when a specific configuration is tested?</div> <div></div> <div></div> <div>Best regards</div> <div>Asbjørn</div><div style="clear:both;"></div>