20 SX20s all running TC7.3.5 software. And TC7.3.6 - Three of the units appear to be experiencing BUG: CSCud08102 
Customer is using a USB dongle and operating the SX20 via creston controller. The units stop communicating with each other and communication can be re-established by unplugging and replugging in the USB connector. - Disconnect happens at any time and is completely random.- it can happen sleeping, during a call or in standby.- Removing the USB and plugging back in is the ONLY way we can re-establish the camera controls. We swapped one of the troubled codecs with a working codec that did NOT have this issue and the problem followed the codec. This was done after swapping out the several USB -to- RS232 dongles and checking commands and control on the DMPS.
On TC7.3.6 issue happened, logs attached, issue happened on 9/8/2016 around 9:30am
2016-09-07T21:25:49.107-04:00 (none) kernel: musb-hdrc musb-hdrc.1: Data toggle same as previous (=0) on ep10
2016-09-08T09:36:07.068-04:00 (none) kernel: hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
2016-09-08T09:36:07.068-04:00 (none) kernel: hub 2-0:1.0: port 1, status 0100, change 0001, 12 Mb/s
2016-09-08T09:36:07.068-04:00 (none) kernel: usb 2-1: USB disconnect, address 2
2016-09-08T09:36:07.068-04:00 (none) kernel: usb 2-1: unregistering device
2016-09-08T09:36:07.068-04:00 (none) kernel: usb 2-1: unregistering interface 2-1:1.0
2016-09-08T09:36:07.068-04:00 (none) kernel: musb-hdrc musb-hdrc.1: shutdown urb c42ee200 ep1in-intr
2016-09-08T09:36:07.068-04:00 (none) kernel: musb-hdrc musb-hdrc.1: Data toggle same as previous (=0) on ep10
2016-09-08T09:36:07.068-04:00 (none) kernel: musb-hdrc musb-hdrc.1: shutdown urb c42ee400 ep3in-bulk
2016-09-08T09:36:07.075-04:00 (none) kernel: pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
2016-09-08T09:36:07.075-04:00 (none) kernel: pl2303 2-1:1.0: device disconnected
2016-09-08T09:36:07.078-04:00 (none) kernel: usb 2-1: usb_disable_device nuking all URBs
2016-09-08T09:36:07.184-04:00 (none) kernel: hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x100
2016-09-08T09:36:44.587-04:00 (none) kernel: hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
2016-09-08T09:36:44.587-04:00 (none) kernel: hub 2-0:1.0: port 1, status 0101, change 0001, 12 Mb/s
2016-09-08T09:36:44.691-04:00 (none) kernel: hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x101
2016-09-08T09:36:44.793-04:00 (none) kernel: usb 2-1: new full speed USB device using musb-hdrc and address 3
2016-09-08T09:36:44.906-04:00 (none) kernel: usb 2-1: default language 0x0409
2016-09-08T09:36:44.906-04:00 (none) kernel: usb 2-1: udev 3, busnum 2, minor = 130
2016-09-08T09:36:44.906-04:00 (none) kernel: usb 2-1: New USB device found, idVendor=0557, idProduct=2008
2016-09-08T09:36:44.906-04:00 (none) kernel: usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
2016-09-08T09:36:44.906-04:00 (none) kernel: usb 2-1: Product: USB-Serial Controller D
2016-09-08T09:36:44.906-04:00 (none) kernel: usb 2-1: Manufacturer: Prolific Technology Inc.
2016-09-08T09:36:44.909-04:00 (none) kernel: usb 2-1: usb_probe_device
2016-09-08T09:36:44.909-04:00 (none) kernel: usb 2-1: configuration #1 chosen from 1 choice
2016-09-08T09:36:44.909-04:00 (none) kernel: usb 2-1: adding 2-1:1.0 (config #1, interface 0)
2016-09-08T09:36:44.909-04:00 (none) kernel: usbserial_generic 2-1:1.0: usb_probe_interface
2016-09-08T09:36:44.909-04:00 (none) kernel: usbserial_generic 2-1:1.0: usb_probe_interface - got id
2016-09-08T09:36:44.909-04:00 (none) kernel: pl2303 2-1:1.0: usb_probe_interface
2016-09-08T09:36:44.909-04:00 (none) kernel: pl2303 2-1:1.0: usb_probe_interface - got id
2016-09-08T09:36:44.909-04:00 (none) kernel: pl2303 2-1:1.0: pl2303 converter detected
2016-09-08T09:36:44.912-04:00 (none) kernel: usb 2-1: pl2303 converter now attached to ttyUSB0
2016-09-08T09:36:44.913-04:00 (none) kernel: drivers/usb/core/inode.c: creating file '003'
2016-09-08T09:36:44.913-04:00 (none) kernel: hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
2016-09-08T09:36:44.913-04:00 (none) kernel: hub 2-0:1.0: port 1 enable change, status 00000103
Bug says is fixed on TC6.1. please let me know what can I do in this case, customer is pushing
