Hi Smartboiiyeet,
Re: any ideas why?
Wondering if your Mac may be short on memory / storage space, so MacOS struggles with memory-intensive tasks.
Eg: A Mac needs at least 50 Gb free for your Operating System to work smoothly
How to: See used and available storage space on your Mac – Apple Support
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Re: can you tell me how to fix it?
If lack of memory / storage space is the cause:
It is wise to back up everything on your Mac to an external storage drive, before deleting unnecessary data / files / etc.
Eg: Back up your Mac with Time Machine - Apple Support
or
How to: Connect and use other storage devices with Mac - Apple Support
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Re: making space
How to: Optimise storage space on your Mac – Apple Support
or
Free up storage space on your Mac - Apple Support
After freeing up space, you may need to empty the bin, and restart your Mac to see the accurate new amount of storage: check storage : Eg: Apple menu > About this Mac
All the best :-)