No sound after 'Conforming Video'

Most of the time Premiere Elements 2018 will work perfectly. Exactly how I want it to work and the edited video is amazing. Sometimes, however, on random projects, in the corner it will say 'Conforming (video file name).m2ts' and it will show the process with a progress bar. But whenever that progress bar gets to 100 per cent, the audio on every clip will disappear immediately, when there was audio beforehand. The footage comes from the same camera every project and it seems that this event happens almost randomly. The file extensions from the camera are all M2TS and the conforming bar says it's conforming (filename).m2ts. Any help is appreciated. Thanks