Very slow booting and shutting down (tens of minutes)

When I turn off the computer, it takes appr 7 minutes(!) to show booting screen with an option to enter BIOS. During those 7 minutes, there is only a black screen with static (not blinking) underscore symbol. After those 9 minutes, the computer boots additional 2 minutes. Previously (just 3 days ago) the whole booting took around 20 sec.
The similar issue is with turning down the computer, except it takes around half an hour. When I click the turn-off computer, the computer doesn't show any signs of doing so. I can normally work. After appr 10 minutes, the computer shows turning-off screen and turns itself down normally, except it does so for a very long time (tens of minutes) before it finally goes down.

How it started
The problem started 3 days ago with shutting down a computer. I have clicked shut down the computer. Windows showed "turning off" screen with the progress of some update. I wasn't aware the Windows updated but I didn't care much. The shutting down took several minutes (as it sometimes happens, so I didn't consider it as a problem at all). The following morning the computer booted very slowly for the very first time.

I am especially worried about that several minutes before the BIOS screen. It makes me think that re-installation may not fix the issue.
Any suggestions on what should I test or try? Thanks a lot for any help

I have tried to restart the computer several times. I don't use "fast start up" option or hibernation (I always boot fresh).
I have tried to search for Windows updates (no updates).
I don't use any external antivirus. I use only default MS Defender with all suggested options turned on.
I have not yet flashed the latest firmware for my motherboard. I was waiting for advice to avoid making the situation worse. Programs seem to work normally and I haven't noticed any slowing down.
I don't see any suspicious activity in Task Manager either (I am not an expert so I have only checked it there is anything which would consume lots of RAM or CPU power).

• Microsoft Windows 10 Professional (x64) Build 19042.804
• APU: AMD Ryzen 3 2200GE
• no dedicated graphics
• 16GB RAM (2GB are dedicated for integrated graphics)
• SSD (the system has 200GB SSD with over 80GB free space) + additional HDD for data

Hi,
thanks a lot for your quick response!

I can attach the full report if needed. I have done a "short self-test" of all drives. No problem found. I haven't yet tested disconnecting HDDs (since I was avoiding very long booting and turning the computer down). Here is results from the SSD test:

-- Physical Disk Information - Disk: #0: INTEL SSDSC2BW180A4 --

Hard Disk Summary
-------------------
Hard Disk Number . . . . . . . . . . . . . . . . : 0
Interface . . . . . . . . . . . . . . . . . . . : S-ATA Gen3, 6 Gbps
Disk Controller . . . . . . . . . . . . . . . . : Standard SATA AHCI Controller (AHCI) [VEN: 1022, DEV: 43C8] Version: 10.0.19041.488, 6-21-2006
Disk Location . . . . . . . . . . . . . . . . . : Bus Number 0, Target Id 0, LUN 0
Hard Disk Model ID . . . . . . . . . . . . . . . : INTEL SSDSC2BW180A4
Firmware Revision . . . . . . . . . . . . . . . : DC12
Hard Disk Serial Number . . . . . . . . . . . . : BTDA3414059S1802GN
Total Size . . . . . . . . . . . . . . . . . . . : 171702 MB
Power State . . . . . . . . . . . . . . . . . . : Active
Logical Drive(s) . . . . . . . . . . . . . . . . : C: []
Current Temperature . . . . . . . . . . . . . . : 29 �C
Power On Time . . . . . . . . . . . . . . . . . : 85 days, 19 hours
Estimated Remaining Lifetime . . . . . . . . . . : more than 1000 days
Lifetime Writes . . . . . . . . . . . . . . . . : 2,79 TB
Health . . . . . . . . . . . . . . . . . . . . . : ###################- 99 % (Excellent)
Performance . . . . . . . . . . . . . . . . . . : #################### 100 % (Excellent)

The status of the solid state disk is PERFECT. Problematic or weak sectors were not found.
The TRIM feature of the SSD is supported and enabled for optimal performance.
The health is determined by SSD specific S.M.A.R.T. attribute(s): #233 Media Wearout Indicator
No actions needed.

The results I have shared are from Hard Disk Sentinel.
Here is the screenshot:

No Driver update between 9th Feb (the last day before problem) and today. The last driver update was 19th Jan (the computer run without problem). The last feature update was 5th Jan.

9th Feb (the last day which booted normally):

Definition Update: Microsoft Defender Antivirus - KB2267602 (Version 1.331.569.0)

10th Feb (already booted very slowly):

Quality Update: 2021-02 Cumulative Update for Windows 10 Version 20H2 for x64-based Systems (KB4601319)
Quality Update: 2021-02 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 20H2 for x64 (KB4601050)
Definition Update: Microsoft Defender Antivirus - KB2267602 (Version 1.331.708.0)
Other Update: Windows Malicious Software Removal Tool x64 - v5.86 (KB890830)

Hi Zinou, thanks for joining!
The Last BIOS time is: 464 sec


I will try to uninstall the two updates from 10th Feb


Unfortunately, I don't see an option to uninstall also the remaining KB890830 from 10th Feb: