Support same files...
Premiere used to support the Samsung 360 mp4 file format, but the newest version doesn't. Please send an update...
trent happel commented
I tried a few Samsung Gear 360 2560x1280 29.97p files and they imported into Premiere Pro 13.0 (CC 2019) without issue.
Could you try quitting Premiere, delete the Media Cache folders, relaunch Premiere and import the files in a new Project. https://forums.adobe.com/thread/2152942
If the issue still occurs, could you please provide more information on exact camera model and if it occurs with specific files? eg: certain frames sizes, etc.
Also, would it be possible for you to supply sample file(s) that fail? This will help us in our investigation.