I have been using LMMS 1.3.0 appimage on Linux Mint since a long time and I never had any problems. Recently I tried to check out ZynAddSubFX, because I never really tried it before. I can open Zyn, I can adjust some parameters there and suddenly, my entire PC resets! This is really weird! I assume it is because of the alpha, because I can't remember this kind of behaviour, when I was using LMMS 1.2.2 back in the days. I'm not sure if this issue is widespread or known among other users, so I just wanted to share it. I don't really have a clue about computers, but I dump some of my specs here. Maybe some expert here will find it useful in analyzing the issue:
System: Kernel: 5.4.0-107-generic x86_64 bits: 64 compiler: gcc v: 9.4.0
Desktop: Cinnamon 5.2.7 wm: muffin dm: LightDM Distro: Linux Mint 20.3 Una
base: Ubuntu 20.04 focal
Machine: Type: Desktop Mobo: ASUSTeK model: A88XM-A v: Rev X.0x serial: <filter>
BIOS: American Megatrends v: 0903 date: 12/06/2013
CPU: Topology: Quad Core model: AMD A8-6600K APU with Radeon HD Graphics bits: 64 type: MCP
arch: Piledriver rev: 1 L2 cache: 2048 KiB
flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 31358
Speed: 1912 MHz min/max: 1900/3900 MHz Core speeds (MHz): 1: 2011 2: 2001 3: 2241
4: 2035
Graphics: Device-1: AMD Richland [Radeon HD 8570D] vendor: ASUSTeK driver: radeon v: kernel
bus ID: 00:01.0 chip ID: 1002:990e
Display: x11 server: X.Org 1.20.13 driver: ati,radeon unloaded: fbdev,modesetting,vesa
resolution: 1440x900~60Hz
OpenGL: renderer: AMD ARUBA (DRM 2.50.0 / 5.4.0-107-generic LLVM 12.0.0)
v: 4.3 Mesa 21.2.6 compat-v: 3.1 direct render: Yes
Audio: Device-1: AMD Trinity HDMI Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel
bus ID: 00:01.1 chip ID: 1002:9902
Device-2: AMD FCH Azalia vendor: ASUSTeK driver: snd_hda_intel v: kernel
bus ID: 00:14.2 chip ID: 1022:780d
Device-3: Texas Instruments PCM2902 Audio Codec type: USB
driver: hid-generic,snd-usb-audio,usbhid bus ID: 3-1:2 chip ID: 08bb:2902
Sound Server: ALSA v: k5.4.0-107-generic
Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK
driver: r8169 v: kernel port: e000 bus ID: 03:00.0 chip ID: 10ec:8168
IF: enp3s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives: Local Storage: total: 111.79 GiB used: 13.14 GiB (11.8%)
ID-1: /dev/sda vendor: Intenso model: SSD Sata III size: 111.79 GiB speed: 6.0 Gb/s
serial: <filter>
Partition: ID-1: / size: 109.04 GiB used: 13.14 GiB (12.1%) fs: ext4 dev: /dev/sda5
Sensors: System Temperatures: cpu: 12.4 C mobo: N/A
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: 217 Uptime: 4h 02m Memory: 22.69 GiB used: 1.21 GiB (5.3%) Init: systemd
v: 245 runlevel: 5 Compilers: gcc: 9.4.0 alt: 9 Client: Unknown python3.8 client
inxi: 3.0.38
System: Kernel: 5.4.0-107-generic x86_64 bits: 64 compiler: gcc v: 9.4.0
Desktop: Cinnamon 5.2.7 wm: muffin dm: LightDM Distro: Linux Mint 20.3 Una
base: Ubuntu 20.04 focal
Machine: Type: Desktop Mobo: ASUSTeK model: A88XM-A v: Rev X.0x serial: <filter>
BIOS: American Megatrends v: 0903 date: 12/06/2013
CPU: Topology: Quad Core model: AMD A8-6600K APU with Radeon HD Graphics bits: 64 type: MCP
arch: Piledriver rev: 1 L2 cache: 2048 KiB
flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 31358
Speed: 1912 MHz min/max: 1900/3900 MHz Core speeds (MHz): 1: 2011 2: 2001 3: 2241
4: 2035
Graphics: Device-1: AMD Richland [Radeon HD 8570D] vendor: ASUSTeK driver: radeon v: kernel
bus ID: 00:01.0 chip ID: 1002:990e
Display: x11 server: X.Org 1.20.13 driver: ati,radeon unloaded: fbdev,modesetting,vesa
resolution: 1440x900~60Hz
OpenGL: renderer: AMD ARUBA (DRM 2.50.0 / 5.4.0-107-generic LLVM 12.0.0)
v: 4.3 Mesa 21.2.6 compat-v: 3.1 direct render: Yes
Audio: Device-1: AMD Trinity HDMI Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel
bus ID: 00:01.1 chip ID: 1002:9902
Device-2: AMD FCH Azalia vendor: ASUSTeK driver: snd_hda_intel v: kernel
bus ID: 00:14.2 chip ID: 1022:780d
Device-3: Texas Instruments PCM2902 Audio Codec type: USB
driver: hid-generic,snd-usb-audio,usbhid bus ID: 3-1:2 chip ID: 08bb:2902
Sound Server: ALSA v: k5.4.0-107-generic
Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK
driver: r8169 v: kernel port: e000 bus ID: 03:00.0 chip ID: 10ec:8168
IF: enp3s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives: Local Storage: total: 111.79 GiB used: 13.14 GiB (11.8%)
ID-1: /dev/sda vendor: Intenso model: SSD Sata III size: 111.79 GiB speed: 6.0 Gb/s
serial: <filter>
Partition: ID-1: / size: 109.04 GiB used: 13.14 GiB (12.1%) fs: ext4 dev: /dev/sda5
Sensors: System Temperatures: cpu: 12.4 C mobo: N/A
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: 217 Uptime: 4h 02m Memory: 22.69 GiB used: 1.21 GiB (5.3%) Init: systemd
v: 245 runlevel: 5 Compilers: gcc: 9.4.0 alt: 9 Client: Unknown python3.8 client
inxi: 3.0.38