cinnamon --replace locking up system and using all resources of powr

I have 4 main production linux boxes that use Cinnamon as the primary Desktop Environment. The process cinnamon --replace process periodically use 100% CPU and load averages off the scale. I am forced to use MATE or XFCE when this happens. After a few days, I go back to cinnamon and all is fine.

Okay, what is this process cinnamon --replace (no Internet search adequately answers this question, so any comers with a reply of "RTFM or the equally stupid reply of "google"", YOU are banished).

Let's hear from Cinnamon developers.

What is cinnamon --replace????

System:
Kernel: 5.4.0-54-generic x86_64 bits: 64 compiler: gcc v: 9.3.0
Desktop: Cinnamon 4.6.7 Distro: Linux Mint 20 Ulyana
base: Ubuntu 20.04 focal
Machine:
Type: Laptop System: Acer product: Predator PT515-51 v: V1.13
serial:
Mobo: CFL model: Ghibli_CFS v: V1.13 serial: UEFI: Insyde v: 1.13
date: 03/04/2020
Battery:
ID-1: BAT0 charge: 68.0 Wh condition: 67.9/82.1 Wh (83%)
model: Getac KT00408001 AP18JHQ status: Not charging
Device-1: hidpp_battery_0 model: Logitech Wireless Mouse M510
charge: 55% (should be ignored) status: Discharging
CPU:
Topology: 6-Core model: Intel Core i7-9750H bits: 64 type: MT MCP
arch: Kaby Lake rev: A L2 cache: 12.0 MiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
bogomips: 62399
Speed: 900 MHz min/max: 800/4500 MHz Core speeds (MHz): 1: 956 2: 924
3: 987 4: 1025 5: 963 6: 918 7: 1000 8: 1091 9: 1007 10: 1405 11: 1003
12: 997
Graphics:
Device-1: Intel UHD Graphics 630 vendor: Acer Incorporated ALI
driver: i915 v: kernel bus ID: 00:02.0
Device-2: NVIDIA TU106M [GeForce RTX 2060 Mobile]
vendor: Acer Incorporated ALI driver: nvidia v: 450.80.02 bus ID: 01:00.0
Display: x11 server: X.Org 1.20.8 driver: modesetting,nvidia
unloaded: fbdev,nouveau,vesa resolution: 1920x1080~144Hz
OpenGL: renderer: GeForce RTX 2060/PCIe/SSE2 v: 4.6.0 NVIDIA 450.80.02
direct render: Yes
Audio:
Device-1: Intel Cannon Lake PCH cAVS vendor: Acer Incorporated ALI
driver: snd_hda_intel v: kernel bus ID: 00:1f.3
Device-2: NVIDIA TU106 High Definition Audio vendor: Acer Incorporated ALI
driver: snd_hda_intel v: kernel bus ID: 01:00.1
Sound Server: ALSA v: k5.4.0-54-generic
Network:
Device-1: Intel Wireless-AC 9560 [Jefferson Peak] vendor: Bigfoot Networks
driver: iwlwifi v: kernel port: 5000 bus ID: 00:14.3
IF: wlp0s20f3 state: up mac:
Device-2: Realtek vendor: Acer Incorporated ALI driver: r8169 v: kernel
port: 3000 bus ID: 40:00.0
IF: enp64s0 state: down mac:
Drives:
Local Storage: total: 74.58 TiB used: 6.67 TiB (8.9%)
ID-1: /dev/nvme0n1 vendor: Samsung model: MZVLB1T0HALR-00000
size: 953.87 GiB
ID-2: /dev/nvme1n1 vendor: Western Digital model: WDBRPG0020BNC-WRSN
size: 1.82 TiB
ID-3: /dev/sda type: USB model: External USB3.0 size: 14.55 TiB
ID-4: /dev/sdb type: USB model: External USB3.0 size: 14.55 TiB
ID-5: /dev/sdc type: USB model: External USB3.0 size: 14.55 TiB
ID-6: /dev/sdd type: USB model: External USB3.0 size: 14.55 TiB
ID-7: /dev/sde type: USB model: External USB3.0 size: 14.55 TiB
RAID:
Device-1: ztank type: zfs status: ONLINE size: 29.10 TiB free: 26.10 TiB
array-1: mirror status: ONLINE size: 14.50 TiB free: 13.10 TiB Components:
online: N/A
array-2: mirror status: ONLINE size: 14.50 TiB free: 13.10 TiB Components:
online: N/A
Partition:
ID-1: / size: 1.79 TiB used: 361.48 GiB (19.7%) fs: ext4
dev: /dev/nvme1n1p2
Sensors:
System Temperatures: cpu: 50.0 C mobo: 42.0 C gpu: nvidia temp: 44 C
Fan Speeds (RPM): N/A
Info:
Processes: 464 Uptime: 4h 08m Memory: 31.22 GiB used: 4.17 GiB (13.4%)
Init: systemd runlevel: 5 Compilers: gcc: 9.3.0 Shell: zsh v: 5.8
inxi: 3.0.38
will %  ~   ✔  681  23:38:11

and why does it f-up my boxes periodically?

Start by reproducing the periodic 100% CPU behavior around the reported cinnamon --replace process on the listed Linux Mint and Cinnamon versions. Inspect the process behavior and Cinnamon runtime logs; the issue is done when the trigger is identified, the resource lockup is fixed, and the behavior is verified on the reported setup.