Hopefully I’m posting in the right place. I’m a long time linux user but an arch noob. After a long relationship with another distro, I’ve decided to switch to EOS, which I really like. I ran a live instance of EOS where audio from youtube was fine. So I installed EOS KDE. Immediately after instalation audio from youtube was still fine. However, after running # pacman -Syu - audio from youtube or rumble at first seems fine, but becomes choppy ie. continually freezing momentarily when Firefox is minimized and when I navigate to another tab (less severe). Works fine from live USB, works fine at install, broken after sudo pacman -Syu
I’ve looked around forums, spoke to AI, tried a number of things but to no avail. It’s a little upsetting because I’m already becoming attached to EOS.
Please help, 
inxi -Fxxc0z | eos-sendlog
Update: Problem is only when using HDMI audio output (tv speakers). I am unable to replicate the problem when using the optical out on my motherboard through an amplifier.
Point of interest: When using the HDMI output with Pavucontrol open on the desktop, youtube playing in Firefox and FF minimized, audio works fine. As soon as I close or minimize Pavucontrol the problem returns. Frustrating and peculiar.