restarting and losing photos

my iPhone 5s kept restarting, and when it turns back on, i lose my photos for a couple of minutes, but then i'll get it back, this has happened a couple of times, and like an hour ago, it kind of glitched and my iCloud, emails, and messenger apps logs out by itself, it also prevented me from connecting to my home wifi, but it's alright now, but it kept restarting and doing the whole photos thing again, i assume this is because i don't have that much space left in my phone, but, this could be something else?