Finished rendered media disappears once I close Adobe Premiere Elements.

I've been using Premiere Elements since May and this has only happened a handful of times. Once my video has finished rendering and is saved to my pc, I click on "open folder" and then proceed to open the file to make sure everything is ok. I see the video and hear the audio. I'm able to skip through it from beginning to end and everything is normal. However, once in a while (like tonight), I then close Premiere Elements and my file disappears. I did NOT delete it or move it. I would literally render/save it, go to YouTube to upload my file, and it would simply be gone. Once I go back into Premiere Elements and try saving it again in the same location, it doesnt even tell me the file previously existed. It's like it was made and then poof! I don't even know if this is taking up space on my pc without me realizing it. I've looked online and haven't found any other references to this. I'd appreciate any help. Thank you.