It’s not an issue with the speaker, as I mentioned it’s an issue with the phones software. Proof by the fact other devices work fine except your Nokia.
What is the exact model number of your phone?
Soundcore Boost crackling sound at high volume
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Nokia 6.1(2018). Model TA-1089
There could be a sync issue as well. Not sure if you see the issue, but if the 2 volume controls (phone and boost) are not in sync you would have an issue. You can try to turn your device volume below 70% as well as the boost volume to 70%, then change the phone volume lower and see if the speaker follows, if it does you have a software quirk like LG does. This happened a lot in older ipods, if you have the base system up over 70% you will end up having cracking out of your speakers when you turn that over 70% as well. (70% is like a magic number as well for volumes and such so its why I listed it)
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Sync issue is possible maybe as when i connect to soundcore volume bar on the top automatically shows up and after that if i immediately try to increase volume it decreases automatically which happens once usually but then after i use to be able to increase volume without any issues. It happened even when i connected to windows laptop but it got synced correctly after increasing and decreasing volume once.
Ja! This could be an idea!
Two ways to adjust the loudness:
The source and the speaker.
I never had issues like this.
(Speaker full level, adjustment at the source.)
Using weird LINUX…
Sometimes works after a lot of “tinkering”
But when … It is a miracle!!! 
I would recommend you to enable developer options if you haven’t already, then go into their settings and disable “Absolute Volume” this prevents excessive loudness between sources and volume changes
ohh yes this seems to be a working solution, i will try once i got my hands on my soundcore. Really appreciate you all here, Thanks a lot. I will post after trying this.
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You are welcome!
We are all here to help and give an advice.
Hope you succeed!
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just checked my soundcore, turned on absolute volume and nothing got fixed it still crackle at high volume and i noticed another thing speaker keeps on disconnecting automatically when i switch apps.
Send support@anker.com a message and let them know the issue you are having and see what they say
Btw, your suppose to disable absolute volume not enable it. Generally its normally on already so if it was off on your phone then keep it off
yes i mean i disabled it but no luck in that and i asked them they just said things about radio interruption and reset soundcore nothing much. Btw i tested on two nokia 6.1 and both of them facing same issue, my ipad3, laptop and nokia 3 are working fine.
Then it’s as I mentioned before with the last phone update it screwed things up. Unless they fix it in a new update you will experience the same problem. It’s an issue with the phone and until an update fixes it theres really nothing that can be done short of forcing a rollback
so I’ve connected my soundcore boost to multiple devices through these days and crackling sound problem happens in my device only but the main issue i am facing now is whenever i stop music the blue light goes blinking and Bluetooth disconnects and after a minute it connects again. It mainly happens on mobile while on laptop there are no drops. Is it a feature or a problem?
anyone help please 
Hi @Jashandeep_Singh , have you tried a fresh pairing of your mobile and the SoundCore Boost to see if the problem is resolved?
You could also try completing a firmware update, which will fix any small issues Anker has found since the speaker was produced.
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yes i updated my soundcore and paired multiple times with different devices and what i found is disconnection mainly happens with newer devices while on old devices this is not happening.
Not sure if this has been mentioned already and I’m too lazy to read through the thread right now but try clearing the data and cache in your Bluetooth settings then resetting your phone and repair the speaker.
i’ve changed phones which works well on other Bluetooth devices. Updated Soundcore’s frimware 3-4 times.
Tested Devices which worked without any issues: XPERIA L, LUMIA 550, NOKIA 3 and iPad 3(disconnected only once).
Tested devices which had disconnection issue: SAMSUNG C7 PRO, ONE PLUS 6 and Nokia 6.1(2018).
And Bluetooth data cleared multiple times in my device already.
Bluetooth disconnects only when music stops playing and it happens within 10 seconds and within 30-40secs it connects again and this cycle continues until i play music.
Have you tried resetting from the speaker end by pressing and holding the power button for 4 seconds or more when in standby?
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yes i did but nothing seems to happen.