Did you try the new --exit-on-zero parameter of 0.3? That should close the miner after at most two minutes after the first 0 sols was detected and the scripts provided with the miner (.bat file in Windows, .sh in Linux) should be able to restart it. Does this work for you? If you want a quicker restart you can set the long stats interval shorter.
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Yes I tried, but it doesn't solve a problem of that why speed falls on 0 sol. There is a wish to find out the reason of it that you have corrected this falling on 0.
Advise please the program for automatic start of your miner when it is switched off. And that I have touched already 3 such bat and not one doesn't work (