Few users including an internet mate of me ... used latest 3.6.4 and upload has been fixed ... in general is more stable
Check it here ↓ and please leave your report in the same thread (and here)
http://www.forum.draytek.co.uk/viewtopic.php?f=2&t=18423
Please get the firmware & give it a go (use *rst* file)
http://www.draytek.com/index.php?option=com_jumi&view=application&fileid=15&Itemid=583&lang=en