In the past I have had this problem too. When this occurs, the green light is on the URI but not blinking. If you do a lsusb at the console it will report the device is detected and active.
But the node will not key up the radio when there is traffic. The only way to recover that I have found is to reboot the box. Also in this condition the node still receives audio and passes it along to any nodes connected. It just doesn't TX anymore.

I had one pc that this happened once or twice a week until the PC finally failed altogether. I replaced the PC with another make model and the problem went away for 3 years. Now it is acting up too.
One thing to note is we tried moving the URI to another port on the pc and that seemed to reduce the intervals between it dropping out. For now it doesn't happen too often now. Maybe once in 3 months so far.

But never seem to get it resolved.  In both cases the PC was a P4 3 gig box with 1 g ram so lats of power to do the job of a 2 node box.

Just my experience on this.

Jon VA3RQ

On 3/26/2014 12:35 PM, Geoff Edmonson wrote:
Just the 2 URI's... Only USB devices on the machine


"Robert A. Poff WB3AWJ" <wb3awj@comcast.net> wrote:

Do you have any other USB devices on the same buss as the URI?

I have two URIs running on  the same platform as KD8B is using on one of our sites.

It has a USB flash drive for the archivedir and auto-backup. With the stick on the same buss as a URI, sometimes odd stuff happened.
Especially on a reboot sometimes it would find and activate the URI, but the transmitter audio was dropping bits left and right.

Moved the flash drive to another buss and that went away.



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