Try these solutions. (1)Too many apps open in phone (2)Heavy Gaming (3)Heavy Streaming-playing heavy media for very long hours (4)Outdated software. Always recommended to update the software :) . There are some tips to free the internal memory. (1)Save photos and videos to EXTERNAL SD card by default rather than internal storage. (2)Clean cache files using Smart Manager /Clean Master application. (3) Move apps to SD Card.
