How to record More than 4GB Video on exFAT?
Because Samsung cannot predict if the user of the phone will have their sdcard formatted with something like exFAT or FAT32, they (samsung) put a size limit of 4GB in to the camera app. If they did not have the file size limit, and a user did have the sdcard formatted with FAT32, the file would not save to disk and could cause other issues as well. They had to scope to the lowest common supported format.

You might be able to find some cameras that have this limit removed. For example, here is a post on XDA that someone modified the camera for the Note 3 (this may, or may not work for your phone) to remove the size limit. The time limit of 90 minutes still exists.