Same problem for me....

System Info: https://bugs.launchpad.net/bugs/747811 (may be related)
---
Jan 29 10:41:22 server kernel: [ 3449.955130] ehci_hcd 0000:00:1a.0: fatal error
Jan 29 10:41:22 server kernel: [ 3449.959056] ehci_hcd 0000:00:1a.0: HC died; 
cleaning up
Jan 29 10:41:22 server kernel: [ 3449.961010] ehci_hcd 0000:00:1a.0: force 
halt; handshake ffffc90001038024 00004000 00004000 
-> -110
Jan 29 10:41:22 server kernel: [ 3449.961046] ehci_hcd 0000:00:1a.0: HC died; 
cleaning up
Jan 29 10:41:22 server kernel: [ 3449.961087] usb 1-1: USB disconnect, device 
number 2
Jan 29 10:41:22 server kernel: [ 3449.961089] usb 1-1.1: USB disconnect, device 
number 10
Jan 29 10:41:22 server kernel: [ 3449.961159] dvb-usb: recv bulk message 
failed: -108
Jan 29 10:41:22 server kernel: [ 3449.961206] dvb-usb: bulk message failed: -19 
(9/0)
Jan 29 10:41:22 server kernel: [ 3449.961230] cinergyT2: 
cinergyt2_fe_set_frontend() Failed! err=-19
Jan 29 10:41:22 server kernel: [ 3449.961230] 
Jan 29 10:41:22 server kernel: [ 3449.961268] dvb-usb: bulk message failed: -19 
(2/0)
Jan 29 10:41:22 server kernel: [ 3449.961270] dvb-usb: error while stopping 
stream.
Jan 29 10:41:22 server kernel: [ 3449.982828] dvb-usb: bulk message failed: -19 
(2/0)

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https://bugs.launchpad.net/bugs/795626

Title:
  ehci_hcd fatal error - USB devices randomly crash

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