I have ThinkPad E590 with 4GB RAM and no SSD

My company give me Lenevo ThinkPad E590 with 4GB of RAM and CPU intel CORE i3.
I installed on in last Manajro with Gnome.
sometimes when I open many app and browser . my system Freez and I can not use it and I have to Turn off it by power key and turn on it again by power key.
My company can not change RAM to 8GB or more.
what is best recommendation for use this ThinkPad?

System:    Host: faridi Kernel: 5.6.19-2-MANJARO x86_64 bits: 64 compiler: gcc v: 10.1.0 Desktop: Gnome 3.36.4 
           Distro: Manjaro Linux 
Machine:   Type: Laptop System: LENOVO product: 20NB0057UE v: ThinkPad E590 serial: <filter> 
           Mobo: LENOVO model: 20NB0057UE serial: <filter> UEFI: LENOVO v: R0YET32W (1.15 ) date: 06/10/2019 
Battery:   ID-1: BAT0 charge: 36.3 Wh condition: 48.2/45.3 Wh (106%) model: SMP 01AV446 status: Discharging 
CPU:       Topology: Dual Core model: Intel Core i3-8145U bits: 64 type: MT MCP arch: Kaby Lake rev: C L2 cache: 4096 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 18406 
           Speed: 1292 MHz min/max: 400/3900 MHz Core speeds (MHz): 1: 1200 2: 1200 3: 1200 4: 1200 
Graphics:  Device-1: Intel UHD Graphics 620 vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0 
           Display: server: X.org 1.20.8 driver: i915 resolution: <xdpyinfo missing> 
           OpenGL: renderer: Mesa Intel UHD Graphics 620 (WHL GT2) v: 4.6 Mesa 20.1.3 direct render: Yes 
Audio:     Device-1: Intel Cannon Point-LP High Definition Audio vendor: Lenovo driver: snd_hda_intel v: kernel 
           bus ID: 00:1f.3 
           Sound Server: ALSA v: k5.6.19-2-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo driver: r8169 v: kernel port: 2000 
           bus ID: 04:00.0 
           IF: enp4s0 state: down mac: <filter> 
           Device-2: Intel Wireless-AC 9260 driver: iwlwifi v: kernel port: 2000 bus ID: 05:00.0 
           IF: wlp5s0 state: up mac: <filter> 
           IF-ID-1: ip_vti0 state: down mac: <filter> 
           IF-ID-2: ppp0 state: unknown speed: N/A duplex: N/A mac: N/A 
Drives:    Local Storage: total: 931.51 GiB used: 87.34 GiB (9.4%) 
           ID-1: /dev/sda vendor: Seagate model: ST1000LM035-1RK172 size: 931.51 GiB 
Partition: ID-1: / size: 915.60 GiB used: 87.34 GiB (9.5%) fs: ext4 dev: /dev/sda2 
Sensors:   System Temperatures: cpu: 42.0 C mobo: 0.0 C 
           Fan Speeds (RPM): cpu: 0 
Info:      Processes: 282 Uptime: 4h 28m Memory: 3.69 GiB used: 2.47 GiB (67.0%) Init: systemd Compilers: gcc: 10.1.0 
           Shell: bash v: 5.0.18 inxi: 3.0.37 

add systemd-swap and zswap
https://wiki.archlinux.org/index.php/Zswap

Thanks.
I think zwap is enable on my manjaro.

That doesn't sound like a ram issue to me tbh. 4 gb is not really that low. Run temperature and ram usage log and see what causes the lock. Can be anything but most likely hardware.

How long have you been using the thinkpad?
How long have you been running Manjaro?

The company bought this ThinkPad for me 5 months ago. for first time I installed Ubuntu on it and it Freez .so I change my OS to Manajro. but that problem happen again.
which app recommend for see temperature?
I try find Good Linux distro for my ThinkPad.

see this link
https://wiki.archlinux.org/index.php/Lm_sensors

Thanks
I see

coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +40.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:        +38.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:        +38.0°C  (high = +100.0°C, crit = +100.0°C)

thinkpad-isa-0000
Adapter: ISA adapter
fan1:           0 RPM
temp1:        +40.0°C  
temp2:         +0.0°C  
temp3:         +0.0°C  
temp4:         +0.0°C  
temp5:         +0.0°C  
temp6:         +0.0°C  
temp7:         +0.0°C  
temp8:         +0.0°C  

acpitz-acpi-0
Adapter: ACPI interface
temp1:        +40.0°C  (crit = +127.0°C)

iwlwifi_1-virtual-0
Adapter: Virtual device
temp1:        +41.0°C  

BAT0-acpi-0
Adapter: ACPI interface
in0:          12.08 V  

pch_cannonlake-virtual-0
Adapter: Virtual device
temp1:        +36.0°C  

I see speed of fan on my ThinkPad is 0.

My ThinkPad freez again and I shutdown it by power key.
I want find cause of root why it hang.

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