u/IntelligentStay8690

So recently I find my iPhone (SE 2nd gen, second hand by family) to be draining out battery more than usual that I actually notice it. And today I was playing a game on my phone and on a specific level it just exitted the game to Home Screen. I used it for roughly 2 years (?) and I don’t know if it’s the phone getting old or have malware inside. I am quite careful with online activities and stuff and I’m just worried about my phone being hacked. It would be great if experienced people can give me some advice. Thx.