Thank you for contacting Plugable! I am sorry to hear that your UD-3900 docking station is not functioning as expected, and would be happy to provide additional support.
To help diagnose the issue, may I ask you to please keep the device connected to your laptop and everything still attached (even if not working as expected) and send us the output of our diagnostic utility PlugDebug? → https://plugable.com/pages/plugdebug
Once you have the logs, simply send an email to firstname.lastname@example.org with the subject line of “Ticket 351649” so that we can prioritize that case and match it to this inquiry.
If you could provide your Amazon Order ID (or other proof of purchase) associated with your Plugable device, I would be happy to check on your warranty status as well.
Thank you for giving us the chance to help!