I'm a new linux user who just installed Zorin OS recently, I'm having an issue where whenever I play videos from YouTube the audio freezes randomly for 1-3 seconds.
What are your computer specs (brand, model)?
Does the sound work otherwise?
What is your output source (speakers, headphones...)?
Do you have you installed the multimedia codecs?
Which browser do you use? In which package format is the browser installed (Zorin package, flatpak, snap)?
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Specs : I7-7700K, Integrated GPU HD Graphics 630, Dedicated GPU GTX 1050 Mobile, 16GB Ram, Laptop MSI GL62M 7RDX.
The sounds doesn't have any problems when they're coming from my laptop speakers only when I connect them to my bluetooth headphones.
They're bluetooth headphones.
I just installed the multimedia codecs from a tutorial and the audio still has the same problem.
I use firefox downloaded from the flathub.
Can you please test if you have the problem with brave browser, too (if brave-browser is still installed on your system as Zorin package)?
I tested it on brave and it's the same
Can you test (e.g. with a downloaded audio file or connected to internet by LAN) if the problem is there when you disable Wlan?
Are the bluetooth phones connected all the time or are they disconnected when the freezes appear?
I downloaded a video (mp4) from youtube and the problem disappeared, I also tested music (mp3) and there wasn't any problems, I also tested with the internet off and it worked
The bluetooth headphone are connected all the time
I also found out when I'm downloading from the flathub or the console the audio freezes more often and the audio even gets distorted
It sounds as if Wi-Fi is interfering with the Bluetooth connection—that's why I asked you to test it. Unfortunately, I don't have a solution off the top of my head, but I'll look into it later.
Maybe it could help to switch to 5 GHz band on your WLAN router (if your router support it) to test if it is better then.
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Thank you 
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Can You specify what You have installed? There are some Options to get Codec Support.
Here I would suggest to take the .deb Version.
Because of this, I would also suggest to check if Your System runs in Wayland or X11. You can do that with the Terminal Command echo $XDG_SESSION_TYPE
I don't know exactly, I just did what this person told me so:
Check on 4:31
I checked and it says "x11"
Okay.
Okay, I looked at it. this is right but these are not all. Open Gnome Software, scroll to the Bottom and there You see a Button called ''Codecs''. Click on it and You get an Overview with available Codec Packages. Install them all.
Then You can get more Codec Support with installing ffmpeg and vlc:
sudo apt install ffmpeg vlc
While trying different things I found out that if I change my sound output from "Headset - ST-Y02" to "Handsfree - ST-Y02" fixes the problem, but the quality of the audio sounds way worse.
Did you test to set 5 GHz band for Wlan if your computer and router support it?
Sometimes the advice is given to add
options iwlwifi bt_coex_active=1 to /etc/modprobe.d/iwlwifi.conf
but I also read posts where the opposite
options iwlwifi bt_coex_active=0
helped when a intel sound card is used and there are interferences between wlan and bluetooth.
I'm not sure which one is better to try. But you could test both one after another and when it doesn't help remove the added line from the file.
I'm not so familar with the given command there and I'm not sure if it is the right one for Zorin 18, because it deleted the content of the existing file and I think you should only add the line at the end of the file.
Maybe someone else can give you better advice.
Edit: When you use this command it should add the line to the existing file and not overwrite the content:
echo "options iwlwifi bt_coex_active=1" | sudo tee -a /etc/modprobe.d/iwlwifi.conf
I don't know if I did it right, but I tried both with the value 0 and 1, but it didn't fix the problem, I'm just very unlucky 
(I did reboot)
That's what I would have done, too. Did you run as well
sudo update-initramfs -u
after you have edited and saved the file?
It was worth a try. Too bad it didn't help.
Then remove the added line from the file and run sudo update-initramfs -u.
There is actually one Package missing:
Another Thing: You could try it with Pulse Audio Volume control. You can install it with sudo apt install pavucontrol and set up Your Headset there and try it with these 2 Modes that You have.
And then there would be still this:
It's alright, at least you tried
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