Bitcoin Forum

Does anyone know what would be causing this its a rev3 it will mine for a couple hours then my PC will not recognize it in device manager.

Try changing the USB cable and or USB hub if used.

After roughly 4-5 hours of mining it once again did not get recognized and went offline on cgminer.

Edit:  i'm going to try and run a seperate batch file this time for my other single and see how this goes over night

What OS?
Any USB power saving features enabled?
What motherboard and power supply?

Win 7 64 bit, power save option was on for all of them but never had any issues with my other single, using a corsair 750w psu motherboard ASUS M3N78-VM and i'm using cgminer I'm noticing its not becoming unrecognizable now that i'm using a second batch file but it still will shut itself off after about 4-6 hours of mining and having to restart cgminer.

If the problem is resolved by restarting cgminer, then it's not the unit. This can be either cgminer failing, network problem or your computer trying to go on standby
or partially tries to turn itself off. Also, are you using a virtual machine?


Regards,
BF Labs Inc.

No i'm not this is my home PC, my rev 2 single has run fine with no issues using cgminer when I added the second one which is rev3 it will turn itself off in cgminer I have the same config for both of them my PC never sleeps or goes in standby its on 24/7.

Maybe swap power bricks to see if the problem continues on the same single.

Well after doing alot of messing around with it it seems that if i run to separate batch files it is fine but when I put the -S com 3 and -S com 5 in 1 batch file the com5 will shutdown its always the rev3 version I've switched the rev2 usb and rev3 usb but its still the rev 3 that shuts off in cgminer.

Edit: I take this back after mining for 4 hours it went offline again and its only the rev 3 that is doing this..

http://puu.sh/Gu4U this is what it will do after a X amount of time mining

try the bitminter client https://bitcointalk.org/index.php?topic=31163.160 (https://bitcointalk.org/index.php?topic=31163.160) see if that works..

if you have java installed, its pretty much just click and go.

my guess would be a hardware problem tho. I would do what the others suggested and try switching the new single to the old singles USB cable and PORT and POWER BRICK and see if the problem switches to the other single.

If you run the unit in isolation (no other singles attached to computer), does the same thing happen? Also please let us know how Bitminter goes.


Regards,
BF Labs Inc.