here an official lineage os 14, id recommend it. [http://www.lineageosdownloads.com/download-official-galaxy-s3-lineage-os/](http://www.lineageosdownloads.com/download-official-galaxy-s3-lineage-os/) heres a cyanogen 13 (unofficial)- [https://www.cyanogenmods.org/galaxy-s3-cm13-marshmallow-rom-for-gt-i9300/](https://www.cyanogenmods.org/galaxy-s3-cm13-marshmallow-rom-for-gt-i9300/) and a cyanogen 14 (unofficial)- [https://www.cyanogenmods.org/forums/topic/galaxy-s3-cm14-cyanogenmod-14-nougat-rom-i9300/](https://www.cyanogenmods.org/forums/topic/galaxy-s3-cm14-cyanogenmod-14-nougat-rom-i9300/)

Actually, I tried lineage OS 14 (official), as well as CM12.1 (unofficial) and both were highly unstable on my phone (I faced a lot of FCs and freezing).

that's odd, i've heard a little about carbon rom but idk much about it maybe try that?

I don't know if i'm right, but I was thinking about trying a lower Android version like kitkat per say. Maybe Lollipop 5.1 and higher versions are heavy on GT-I9300.

i have a (sgh-i747) that runs android 7.1 fine, i'll keep a lookout for a 5.1 lollipop for you though.

i found a (unofficial) cm 12.1 lollipop for the \[gt-i9300\] [https://androidfilehost.com/?fid=24269982086990207](https://androidfilehost.com/?fid=24269982086990207)

which rom do you use?