Handoff works with issues on my mac and iPhone

Hello! I have an issue with the handoff feature between iPhone and macbook air 13 2017. I use mackOS high siera 10.13.3 and iPhone 5S iOs 11.4. Handoff feature often doesn't work at all even if bluetooth is turned on and handoff option is turned on on an Iphone and on a mac. What can i do to fix it? Thank you!

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