I have installed the laest 3.11 kernel (3.11.0-999-generic #201307150405 SMP Mon Jul 15 08:06:42 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux) and so far there were no connection drops.
However i see these errors in syslog when the connection "freezes or stalls" for a while (no idea if it's related or not, just thought it might be worth to check):

Jul 15 19:23:47 vault kernel: [ 6662.366799] pcieport 0000:00:03.0: AER: Corrected error received: id=0018
Jul 15 19:23:47 vault kernel: [ 6662.366811] pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, id=0018(Transmitter ID)
Jul 15 19:23:47 vault kernel: [ 6662.366815] pcieport 0000:00:03.0:   device [8086:d138] error status/mask=00001000/00002000
Jul 15 19:23:47 vault kernel: [ 6662.366819] pcieport 0000:00:03.0:    [12] Replay Timer Timeout  
Jul 15 20:17:01 vault CRON[26145]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Jul 15 21:06:45 vault kernel: [12840.118574] usb 2-1.4: USB disconnect, device number 3
Jul 15 21:06:45 vault kernel: [12840.389722] usb 2-1.4: new low-speed USB device number 4 using ehci-pci
Jul 15 21:06:45 vault kernel: [12840.488735] usb 2-1.4: New USB device found, idVendor=045e, idProduct=00cb
Jul 15 21:06:45 vault kernel: [12840.488744] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Jul 15 21:06:45 vault kernel: [12840.488750] usb 2-1.4: Product: Microsoft Basic Optical Mouse v2.0 
Jul 15 21:06:45 vault kernel: [12840.488754] usb 2-1.4: Manufacturer: Microsoft 
Jul 15 21:06:45 vault kernel: [12840.491968] input: Microsoft  Microsoft Basic Optical Mouse v2.0  as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/input/input16
Jul 15 21:06:45 vault kernel: [12840.492543] hid-generic 0003:045E:00CB.0002: input,hidraw0: USB HID v1.11 Mouse [Microsoft  Microsoft Basic Optical Mouse v2.0 ] on usb-0000:00:1d.0-1.4/input0
Jul 15 21:17:01 vault CRON[5314]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Jul 15 21:31:29 vault kernel: [14324.515282] pcieport 0000:00:03.0: AER: Corrected error received: id=0018
Jul 15 21:31:29 vault kernel: [14324.515294] pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, id=0018(Transmitter ID)
Jul 15 21:31:29 vault kernel: [14324.515298] pcieport 0000:00:03.0:   device [8086:d138] error status/mask=00001000/00002000
Jul 15 21:31:29 vault kernel: [14324.515301] pcieport 0000:00:03.0:    [12] Replay Timer Timeout  
Jul 15 21:42:32 vault kernel: [14987.581500] pcieport 0000:00:03.0: AER: Corrected error received: id=0018
Jul 15 21:42:32 vault kernel: [14987.581510] pcieport 0000:00:03.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, id=0018(Transmitter ID)
Jul 15 21:42:32 vault kernel: [14987.581513] pcieport 0000:00:03.0:   device [8086:d138] error status/mask=00001000/00002000
Jul 15 21:42:32 vault kernel: [14987.581516] pcieport 0000:00:03.0:    [12] Replay Timer Timeout  
Jul 15 21:59:55 vault kernel: [16029.878777] usb 2-1.4: USB disconnect, device number 4
Jul 15 21:59:55 vault kernel: [16030.111632] usb 2-1.4: new low-speed USB device number 5 using ehci-pci
Jul 15 21:59:55 vault kernel: [16030.210361] usb 2-1.4: New USB device found, idVendor=045e, idProduct=00cb
Jul 15 21:59:55 vault kernel: [16030.210370] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Jul 15 21:59:55 vault kernel: [16030.210375] usb 2-1.4: Product: Microsoft Basic Optical Mouse v2.0 
Jul 15 21:59:55 vault kernel: [16030.210380] usb 2-1.4: Manufacturer: Microsoft 
Jul 15 21:59:55 vault kernel: [16030.213716] input: Microsoft  Microsoft Basic Optical Mouse v2.0  as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/input/input17
Jul 15 21:59:55 vault kernel: [16030.214116] hid-generic 0003:045E:00CB.0003: input,hidraw0: USB HID v1.11 Mouse [Microsoft  Microsoft Basic Optical Mouse v2.0 ] on usb-0000:00:1d.0-1.4/input0
Jul 15 22:03:03 vault kernel: [16218.550476] usb 2-1.4: USB disconnect, device number 5
Jul 15 22:03:04 vault kernel: [16218.843522] usb 2-1.4: new low-speed USB device number 6 using ehci-pci
Jul 15 22:03:04 vault kernel: [16218.942609] usb 2-1.4: New USB device found, idVendor=045e, idProduct=00cb
Jul 15 22:03:04 vault kernel: [16218.942618] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Jul 15 22:03:04 vault kernel: [16218.942624] usb 2-1.4: Product: Microsoft Basic Optical Mouse v2.0 
Jul 15 22:03:04 vault kernel: [16218.942629] usb 2-1.4: Manufacturer: Microsoft 
Jul 15 22:03:04 vault kernel: [16218.945914] input: Microsoft  Microsoft Basic Optical Mouse v2.0  as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/input/input18
Jul 15 22:03:04 vault kernel: [16218.946545] hid-generic 0003:045E:00CB.0004: input,hidraw0: USB HID v1.11 Mouse [Microsoft  Microsoft Basic Optical Mouse v2.0 ] on usb-0000:00:1d.0-1.4/input0