thx for ur reply
i am using EWBF's miner
How can i make a reconnect after a period of time automatically
i don't have extra raisers and also the rig i put it in my friend's home so i can't make trying
I am afraid its not in the feature of EWBF, however found this one.
https://bitcointalk.org/index.php?topic=2466188.0I am not using the code posted but might be helpful, please bear in mind that it would restart the miner when a certain GPU failed and with 0 hash, otherwise if its hardware issue it may not solve your problem as it would hang the whole system.
best is to visit your friend and isolate.

thanks a lot .. you are my hope here
gpu not give 0 hash at all and all my system work fine and can do any changes in desktop or else while the miner stopped not give me new work or accepted hashes juts in the wimdow of miner no extra lines can appear once i click enter in the miner making reconnect to the pool and come back to continue mining again
i hope to explain my problem right with my bad language
so i don't know why the miner do that .. i hope any command can put to make the reconnect automatically