Small tasks stop sometimes and do nothing for hours.
Progress percent ain't changing for hours.
Closing/opening BOINC manager helps right away, percentage increasing goes on.

My info:
Win 10, BOINC 7.16.20 (x64)

Device name DESKTOP-M5OV3FC
Processor Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz 3.20 GHz
Installed RAM 16.0 GB (15.9 GB usable)
Device ID C55D4534-D3A5-48BE-B08A-0F962AD37715
Product ID 00331-10000-00001-AA359
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display

Edition Windows 10 Pro
Version 21H2
Installed on ‎9/‎21/‎2021
OS build 19044.1706
Experience Windows Feature Experience Pack 120.2212.4170.0

Task info:
Application
Milkyway@home N-Body Simulation 1.82 (mt)
Name
de_nbody_08_31_2021_v176_40k__data__12_1647295263_5897641
State
Running
Received
5/20/2022 12:03:41 PM
Report deadline
6/1/2022 12:03:43 PM
Resources
4 CPUs
Estimated computation size
21,013 GFLOPs
CPU time
00:14:34
CPU time since checkpoint
00:01:06
Elapsed time
00:24:16
Estimated time remaining
00:37:05
Fraction done
39.562%
Virtual memory size
11.36 MB
Working set size
15.10 MB
Directory
slots/0
Process ID
3896
Progress rate
1.734% per minute
Executable
milkyway_nbody_1.82_windows_x86_64__mt.exe

Screenshot here (hanging task marked red):
http://www.gotai.net/Wiki/?action=image&name=f52bede7-04f3-47d6-a62c-456843647179.jpg

check out these 2 threads. they may help.

https://milkyway.cs.rpi.edu/milkyway/forum_thread.php?id=4849
https://milkyway.cs.rpi.edu/milkyway/forum_thread.php?id=4295#67559

Also try this one.
https://milkyway.cs.rpi.edu/milkyway/forum_thread.php?id=4824