Connection interrupt worker

[Espie]

Hi,

I have four workers in Multipool and one of them (Gigabyte R9 280x Windforce Rev2) is showing strange behavior. Cgminer finds a new block and after that "Stratum connection to pool 0 interrupted". Also the hashrate is very poor, < 300 Khash.

http://i149.photobucket.com/albums/s58/EspieNL/Untitled_zps1624167c.png

I use settings:  -g 1 -w 256 --shaders 2048

With this card I should be able to get close to 700 Khash


Update:

After running the cgcimer in debug mode, I see "GPU0: Invalid nonce - HW Error"
Seems my card broke down.