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Because you vote to often, your votingpower went down to 26,23%.
Every vote you do cost you 2% of your votingpower and your votingpower will regenerate about 20% a day or in other words 0,83 every hour. you should try to don't be under 80% and not to long at 100%. At Steemnow.com you can check your votingpower. Simply type in the right upper corner your username and click save.

omg, i thought that the power was growing up with upvotes, i was wrong :'(

I think you mixed up STEEMpower and Votingpower

Don't do too many upvotes, suggestions approximately 3-5 votes every 2 hours.
Just my opinion.

aww thank you!

You run out of juice.

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