just got my RB back today after 3 weeks in repair for the same problem. In fact I had 2 the same unbelievabley. My box(es) were sent to Waters and Stanton via the retailer I bought them from. It was requested that they strengthen the solder for me , and they have done so. Maybe you could request the same, as the usb sockets are only lightly soldered (you can see how it sits if you have a torch and a good eye) I only had the boxes in Jan too. Hope this helps.