Modpacks keep crashing

[Xeno_Playz]

I'm sorta new to these forums never had to really ask for help so bare with me. So Technic lets me play modpacks but I've noticed while I'm playing it keeps eating my C drive space (I usually keep around 10gb free), Once it hits 0 or NTFS the game crashes. Once I close the game and run Storage Sense it goes back up to where it should be. I know theres logs but being new I dont quite know how to give them, any help on the matter would be great. I'm playing on The 1.12.2 Pack, Thank you for you help/time.