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I would like you to send me a troubleshoot file. Please, replicate the issue, then access router's WebUI, go to System -> Administration > Troubleshoot section and download troubleshoot file from there.
I would like you to update the firmware version to the latest, without keeping settings from current configuration. You can download firmware file from here: https://wiki.teltonika-networks.com/wikibase/images/9/91/RUT9_R_00.07.01.4_WEBUI.bin.