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it throws me error most of the time

Maybe you can try another Steem node. You can choose one at the top right of the page.
Let me know the error of that didn't help.

this is what exactly happens, changing the node api doesn't work. It has been quit a long time since I'm getting this error

That is strange. The node api.steemitdev.com works properly here. Did you try anyx.io or api.steem.house? Both should work.

I get same result with available APIs there, with around 5% success rate

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