iPhone XR taking screenshots automatically and overheating

Upon looking at my battery health, apparently it is in good condition so I guess the temperature of my phone getting hot is not the battery any other explanations? I was actually shocked to see the battery health this good.

Reply to your comment thank you for your information. That makes sense about the temperature of my phone because my phone is in fact, nine years old. It’s been a great phone and it’s only been recently since it started acting up however, I wish I had some answers about the screenshots being taken place by itself. That’s the biggest concern.. the temperature issue that you explained makes sense thank you. Do you have any answers about why screenshots will occur and coincidentally on apps that are sensitive such as Passwords photos banks of that nature I haven’t noticed any unusual activity on my banks or anything, but this is just extremely concerning because it all started happening all at once the way my phone started lagging and the screenshots and temperature if you or anybody has the ability to explain to me how to check for malware or detect any type of scammer on my phone. I don’t know where to start and it’s frustrating and I don’t want to accidentally do something that’s gonna make my device even more of a nuisance. Thanks in advance.