Once calibre is force closed then it will open straight away. I then restarted in debug mode and it gave this below but it can always restart.
Spoiler:
ApplicationPaletteChange event ignored
Using calibre Qt style: True
ApplicationPaletteChange event received
calibre Debug log
calibre 8.5 embedded-python: True
Windows-10-10.0.26100-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.26100')
Python 3.11.12
Windows: ('10', '10.0.26100', 'SP0', 'Multiprocessor Free')
Interface language: None
EXE path: C:\Program Files\Calibre2\calibre-debug.exe
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (2, 25, 0) && DeDRM (10, 0, 9) && Package KFX (from KFX Input) (2, 25, 0) && KFX metadata reader (from KFX Input) (2, 25, 0) && From KFX (2, 25, 0) && KFX Input (2, 25, 0)
calibre 8.5 embedded-python: True
Windows-10-10.0.26100-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.26100')
Python 3.11.12
Windows: ('10', '10.0.26100', 'SP0', 'Multiprocessor Free')
Interface language: None
EXE path: C:\Program Files\Calibre2\calibre-debug.exe
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (2, 25, 0) && DeDRM (10, 0, 9) && Package KFX (from KFX Input) (2, 25, 0) && KFX metadata reader (from KFX Input) (2, 25, 0) && From KFX (2, 25, 0) && KFX Input (2, 25, 0)
QPA platform: windows
devicePixelRatio: 1.25
logicalDpi: 96.0 x 96.0
physicalDpi: 113.41395348837209 x 113.12164948453608
[0.00] Starting up...
[0.02] Showing splash screen...
[1.23] splash screen shown
[1.23] Initializing db...
[1.36] db initialized
[1.36] Constructing main UI...
[2.62] GUI main window shown
[2.78] main UI initialized...
[2.78] Hiding splash screen
[2.78] splash screen hidden
[2.78] Started up in 2.78 seconds with 1185 books
[22.78] Shutdown starting...
[25.12] Shutdown complete, quitting...