I also had problems with Verbindungsabrüchen and inexplicable hangers computer to blue screens. The overall program maintenance; I wanted to throw the thing in the toilet flush. Since the decisive tip came to connect an external hub in between. All said and done, now the drive is running properly and the transmission rate is very good. Here it should be mentioned that I have decided for an active hub (with AC adapter) from Belkin.
I only give 4 stars for the additional costs of an extra acquisition and because AVM is not necessary for holding this problem solution on their site to publish.