I can emulate the Sound/Video effect of the problem by right clicking on Pulseaudio in System Monitor, then "Stop Process" and "Continue Process" in quick succession. That's how the random problem sounds and looks while playing back Web-Video in Browser or video-file in Celluloid.
Distribution default setting for Pulseaudio is Nice: -11 and Priority: Very High. It's the only process not "Normal" Priority.
I tried "Change Priority" "custom" Slider to Nice: -20. Didn't help.
I had this problem years ago with the same PC (Mintbox 2) and an earlier Linux Mint. I solved it and was lucky until some weeks ago the drive crashed. I remember loosely the solution was something with the priority? Setting processes higher or lower? Making the change permanent? Mint looks different today, so my memory does not fresh up.
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System:
Kernel: 5.4.0-96-generic x86_64 bits: 64 compiler: gcc v: 9.3.0
Desktop: MATE 1.26.0 info: mate-panel wm: marco 1.26.0 dm: LightDM 1.30.0
Distro: Linux Mint 20.3 Una base: Ubuntu 20.04 focal
Machine:
Type: Laptop System: CompuLab product: Intense-PC v: 1.x serial: <filter>
Mobo: CompuLab model: Intense-PC v: 1.x serial: <filter>
UEFI [Legacy]: Phoenix v: CR_2.2.0.400 X64 date: 12/12/2013
CPU:
Topology: Dual Core model: Intel Core i5-3337U bits: 64 type: MT MCP
arch: Ivy Bridge rev: 9 L2 cache: 3072 KiB
flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 14366
Speed: 798 MHz min/max: 800/2700 MHz Core speeds (MHz): 1: 798 2: 798
3: 798 4: 798
Graphics:
Device-1: Intel 3rd Gen Core processor Graphics driver: i915 v: kernel
bus ID: 00:02.0 chip ID: 8086:0166
Display: x11 server: X.Org 1.20.13 driver: modesetting
unloaded: fbdev,vesa compositor: marco v: 1.26.0
resolution: 1680x1050~60Hz
OpenGL: renderer: Mesa DRI Intel HD Graphics 4000 (IVB GT2)
v: 4.2 Mesa 21.0.3 compat-v: 3.0 direct render: Yes
Audio:
Device-1: Intel 7 Series/C216 Family High Definition Audio
driver: snd_hda_intel v: kernel bus ID: 00:1b.0 chip ID: 8086:1e20
Sound Server: ALSA v: k5.4.0-96-generic
Network:
Device-1: Intel 82579LM Gigabit Network driver: e1000e v: 3.2.6-k
port: 4080 bus ID: 00:19.0 chip ID: 8086:1502
IF: enp0s25 state: up speed: 100 Mbps duplex: full mac: <filter>
Device-2: Realtek RTL8723AE PCIe Wireless Network Adapter
driver: rtl8723ae v: kernel port: 3000 bus ID: 04:00.0 chip ID: 10ec:8723
IF: wlp4s0 state: down mac: <filter>
Device-3: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
driver: r8169 v: kernel port: 2000 bus ID: 05:00.0 chip ID: 10ec:8168
IF: enp5s0 state: down mac: <filter>
Drives:
Local Storage: total: 55.90 GiB used: 16.57 GiB (29.6%)
ID-1: /dev/sda vendor: OCZ model: VERTEX2 size: 55.90 GiB speed: 3.0 Gb/s
serial: <filter> rev: 1.25 scheme: MBR
Partition:
ID-1: / size: 54.28 GiB used: 16.57 GiB (30.5%) fs: ext4 dev: /dev/sda5
Sensors:
System Temperatures: cpu: 56.0 C mobo: 56.0 C
Fan Speeds (RPM): N/A
Repos:
No active apt repos in: /etc/apt/sources.list
Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
1: deb http://packages.linuxmint.com una main upstream import backport #id:linuxmint_main
2: deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
3: deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
4: deb http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
6: deb http://archive.canonical.com/ubuntu/ focal partner
Info:
Processes: 205 Uptime: 25m Memory: 3.30 GiB used: 1.41 GiB (42.6%)
Init: systemd v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 9 Shell: bash
v: 5.0.17 running in: mate-terminal inxi: 3.0.38