Why would your ssd being full make that happen?
80% isn’t full enough to cause problems. Potentially corrupted cells tho.
You need to have at least 7% of the ssd space unallocated for garbage collection for optimal performance. Some ssd's don't have a hardware preallocated space for garbage collection, some do. You can manipulate this with special software tools, for example the linux tool hdparm, but for the common user it's not necessary and might brick your drive if you don't know what you are doing.
Usually you can look at the advertised capacity to judge if it does have a preallocated empty space or not, for example a 512gb drive would be advertised as 480 gb if does and 512gb if it doesn't.
If it doesn't just go to windows disk management and select the "shrink" option and calculate 7% of the full capacity. Then run the windows disk optimization tool and schedule it to run weekly, which should be default. It sends the TRIM comand to the drive.
doubt its that but download spacesniffer and run it as admin