I have a Galaxy S4 i9505 jflte
Link2sd is linking apps on card used extensively in my previous phone samsung class 10 ext4 format.
Twice after installing/configuring the phone just autoresets and looses all apps each time I wipe everything re install however on last autoreset it entered a loop and even with factory reset/wipa cache etc ( TWRP 2.7 ) it didn't started so I format/wiped everything and did a fresh room install.
1 version was - CARBON-KK-NIGHTLY-20140619-0506-jflte.zip
2 version was - CARBON-KK-NIGHTLY-20140622-0319-jflte.zip
Do you believe this is a hardware fault or software fault?