You have a three or four year old version of Premiere Elements, some version of an Android phone and only some clips cause trouble. That is not much to work with!
I'll change my guess. Your phone is set to record files that can't be edited in Premiere Elements 15. What is the structure of the files, including the codec? What are the video settings in your phone? Do the terms "HEVC" or "H.265" mean anything?