Bad sound when opened MuseScore

Hi,
sometimes when I open MuseScore the sound gets noisy (a little bit like clipping) and a weird echo effect. At times it affects also other applications that use sound like VLC. It never happens if I open a song with vlc media player first and then open musescore.
Machine:

System: Host: blabla Kernel: 4.14.74-1-MANJARO x86_64 bits: 64 Desktop: KDE Plasma 5.13.5
Distro: Manjaro Linux
Machine: Type: Laptop System: Acer product: Swift SF314-52 v: V1.07 serial:
Mobo: KBL model: Suntory_KL v: V1.07 serial: UEFI: Insyde v: 1.07 date: 11/02/2017
Battery: ID-1: BAT0 charge: 37.3 Wh condition: 37.3/50.8 Wh (73%)
CPU: Topology: Quad Core model: Intel Core i5-8250U bits: 128 type: MT MCP L2 cache: 6144 KiB
Speed: 9000 MHz min/max: 4000/34000 MHz Core speeds (MHz): 1: 9000 2: 9000 3: 9000 4: 9000 5: 9000 6: 9000
7: 9000 8: 9000
Graphics: Device-1: Intel UHD Graphics 620 driver: i915 v: kernel
Display: x11 server: X.Org 1.20.1 driver: intel unloaded: modesetting resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa DRI Intel UHD Graphics 620 (Kabylake GT2) v: 4.5 Mesa 18.2.2
Audio: Device-1: Intel Sunrise Point-LP HD Audio driver: snd_hda_intel
Sound Server: ALSA v: k4.14.74-1-MANJARO
Network: Device-1: Intel Wireless 7265 driver: iwlwifi
IF: wlp3s0 state: up mac: f8:59:71:6d:e5:8e
Drives: Local Storage: total: 238.47 GiB used: 96.18 GiB (40.3%)
ID-1: /dev/nvme0n1 vendor: Intel model: SSDPEKKW256G7 size: 238.47 GiB
Partition: ID-1: / size: 224.77 GiB used: 96.18 GiB (42.8%) fs: ext4 dev: /dev/nvme0n1p2
ID-2: swap-1 size: 8.80 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/nvme0n1p3
Sensors: System Temperatures: cpu: 41.0 C mobo: N/A
Fan Speeds (RPM): N/A
Info: Processes: 193 Uptime: 6h 00m Memory: 7.67 GiB used: 3.40 GiB (44.3%) Shell: bash inxi: 3.0.26