Now this time I had a look at /var/log/syslog and found these lines repeated many times before the hard reboot:
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Apr 13 17:28:06 ideapad kernel: [207091.422937] amdgpu 0000:03:00.0: VM_L2_PROTECTION_FAULT_STATUS:0x00701031
Apr 13 17:28:06 ideapad kernel: [207091.423016] amdgpu 0000:03:00.0: [gfxhub] retry page fault (src_id:0 ring:0 vmid:7 pasid:0, for process pid 0 thread pid 0)
Apr 13 17:28:06 ideapad kernel: [207091.423019] amdgpu 0000:03:00.0: in page starting at address 0x0000800102788000 from 27
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Apr 13 17:28:10 ideapad kernel: [207091.506958] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] *ERROR* Waiting for fences timed out or interrupted!
Apr 13 17:28:10 ideapad kernel: [207096.426582] gmc_v9_0_process_interrupt: 58452 callbacks suppressed
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inxi -Fxz
System: Host: ideapad Kernel: 5.3.0-47-generic x86_64 bits: 64 compiler: gcc v: 7.5.0 Desktop: Cinnamon 4.4.8
Distro: Linux Mint 19.3 Tricia base: Ubuntu 18.04 bionic
Machine: Type: Laptop System: LENOVO product: 81H1 v: Lenovo ideapad 530S-14ARR serial: <filter>
Mobo: LENOVO model: LNVNB161216 v: SDK0J40700 WIN serial: <filter> UEFI: LENOVO v: 8PCN57WW date: 10/10/2019
Battery: ID-1: BAT0 charge: 36.5 Wh condition: 36.5/45.5 Wh (80%) model: CPT-COS L17C4PB0 status: Full
CPU: Topology: Quad Core model: AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx bits: 64 type: MT MCP arch: Zen
L2 cache: 2048 KiB
flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 31941
Speed: 1370 MHz min/max: 1600/2000 MHz Core speeds (MHz): 1: 1429 2: 1369 3: 1423 4: 1413 5: 1472 6: 1381 7: 1379
8: 1526
Graphics: Device-1: AMD Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] vendor: Lenovo driver: amdgpu v: kernel
bus ID: 03:00.0
Display: x11 server: X.Org 1.19.6 driver: amdgpu,ati unloaded: fbdev,modesetting,radeon,vesa
resolution: 1920x1080~60Hz
OpenGL: renderer: AMD RAVEN (DRM 3.33.0 5.3.0-47-generic LLVM 9.0.1)
v: 4.6 Mesa 20.1.0-devel (git-5e6267b 2020-04-12 bionic-oibaf-ppa) direct render: Yes
Audio: Device-1: Advanced Micro Devices [AMD/ATI] vendor: Lenovo driver: snd_hda_intel v: kernel bus ID: 03:00.1
Device-2: Advanced Micro Devices [AMD] vendor: Lenovo driver: snd_hda_intel v: kernel bus ID: 03:00.6
Sound Server: ALSA v: k5.3.0-47-generic
Network: Device-1: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter vendor: Lenovo driver: ath10k_pci v: kernel
bus ID: 01:00.0
IF: wlp1s0 state: up mac: <filter>
Device-2: Atheros type: USB driver: btusb bus ID: 1-4:2
Drives: Local Storage: total: 238.47 GiB used: 83.22 GiB (34.9%)
ID-1: /dev/nvme0n1 model: HFM256GDHTNG-8310A size: 238.47 GiB
Partition: ID-1: / size: 28.71 GiB used: 16.88 GiB (58.8%) fs: ext4 dev: /dev/nvme0n1p5
ID-2: /home size: 163.93 GiB used: 66.30 GiB (40.4%) fs: ext4 dev: /dev/nvme0n1p6
Sensors: System Temperatures: cpu: 49.1 C mobo: N/A
Fan Speeds (RPM): N/A
Info: Processes: 269 Uptime: 18m Memory: 7.33 GiB used: 2.43 GiB (33.2%) Init: systemd runlevel: 5 Compilers: gcc: 7.5.0
Shell: bash v: 4.4.20 inxi: 3.0.32