Why do I have such high data usage in Win10 Preview on my Lumia 535?

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Windows Central Question

high data usage in win10 preview in lumia 535

I have upgraded my lumia 535 dual sim from win8.1 to win10 2 weeks ago with insider preview 10.0.10166.0 and now my phone is using about 1 mb per minute without doing anything. I m starting my mobile data and it is being used up. Sometimes there is very high data usage like 200 mb in just 5 min only searching something in the browser. This usage is not shown in data usage details. Sometimes it is being used by the system. Please help me.