XDA forum members tobenary and Ewle have both confirmed that KingRoot seems to be the cause for their Kodi installation to crash, 25 minutes into watching a video stream, on their Amazon Fire TV and Fire TV Stick. After uninstalling Kinguser, the SU permission handler that KingRoot installs, both have reported the crashing has stopped. If you’ve rooted with KingRoot and are experiencing Kodi crashes, try uninstalling KingRoot and KingUser to resolve the issue. It’s not being rooted that is causing the crash, but something about Kinguser specifically being present.
When KingRoot was first confirmed to root the Fire TV and Fire TV Stick running Fire OS 5, I attempted to identify all the changes the app makes to the Fire TV’s operating system during the rooting process. I gave up once my list grew to 20 items long and continued to climb. This is why I’ve always suggested not using KingRoot until TWRP and a pre-rooted ROM is available for your device. Like I outline in my latest Fire TV 2 rooting guide, installing a pre-rooted ROM through TWRP and factory reseting the device after you root with KingRoot is the best way to ensure you have a clean rooted device without any of the junk and changes that KingRoot makes.
Rbox is still working on TWRP and pre-rooted ROMs for the 1st-gen Fire TV and the Fire TV Stick. To avoid KingRoot related issues like this one, owners of those devices who wish to root should block software updates to stay on software version 5.0.5 until TWRP and a pre-rooted ROM are released for your device. I’ll have a guide posted on how to root with KingRoot, install TWRP, and clean up your device with a pre-rooted ROM for those older devices as soon as rbox releases the necessary files.