Hi,

I have been working on the beaglebone since 1 year now and I had no issue 
since some days ago.
I am using the BBB with a motherboard which among other thing is powering 
the BBB .
The issue happens when I am first plugging the mini USB to a PC then plug 
the power from the motherboard. The symptoms are that the i2c busses 1 and 
2 are timeouting when I am doing i2c request.Bus 0 is fine.
If I do a i2cdetect -y -r 1 it takes about 2 secs poling each adress . The 
other symptom is that sometimes I loose ethernet over usb connection .
I tried several BBB (rev B and C) with several motherboards and issue is 
still there.
The other strange thing is that for now It happens only on 1 PC. Here again 
I tried different USB port with same behavior. 
I have read lots of messages from this group without finding anything close 
to my issue. The only similar issue I have found is here : 
http://stackoverflow.com/questions/29140579/beaglebone-black-stops-when-external-powered
I tried the latest release debian 2015-03-01 and althought it seemed more 
stable than mine which is from april 2014 I am still experiencing the issue.
So any idea or similar experience is welcomed !
Thanks,

RW

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