Ok this is not good, it's constantly writing to the drive, meaning if it sits on the SSD for days and days, just writing - that is technically slowly killing the SSD/M.2 drive.
Edit:
The issue is now fixed!Thank you, Riot! :)
This might be related to a an issue we just pushed out a fix for. Please restart to download the latest version. Make sure the RiotClientServices.exe process is dead prior to starting the game back up again, I think it may have been getting stuck for a few people. Let us know if you still run into this after updating to the latest version.