Clicking sound.Need help

Hello friends.I have a problem that drive me crazy.On first gear and sometimes in second i hear a metalic sound like a click or two clicks sound.The click,sound at a certain time about every rotation or something like that.I was at the mechanic he adjusted the deraieur,service the hub,i change the deraieur hanger,new chain,but the sound is still there.Only problem i can see is at deraieur who have a little body move and some kind of click sound at bolts.The transmision is 1x11 Sram gx with 11-46 sunrace casette.bike is 1 year old.Please help and sorry for my english.Have a nice day
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