My apps keep closing

Hi, I'm having some issues with my tablet and I'm not really sure why this is happening. My apps repeatedly close while they are in use, and it's super irritating. Most especially when I'm playing a game. I assure you that I'm not doing anything that would cause them to close, they just do it themselves. This also happens whennI try to upload an image to social medias, once I open the gallery, which ever app I had open just closes out completely. Any idea what's going on or how I could fix this?