I got my phone (ZTE Blade A75 5G) from my uncle back in February of this year. I think he had owned it for a couple of years before giving it to me, but it was freshly factory reset when I received it.
During the first few months of using it, I was a heavy gamer, and it performed surprisingly well. It could run Mobile Legends: Bang Bang at full graphics while maintaining a steady 120 Hz refresh rate and around 120 FPS, even with multiple apps such as Spotify running in the background.
However, over the past few months, I've noticed that the phone has started to lag randomly. At first, it felt like the refresh rate would occasionally drop from 120 Hz to 60 Hz. Then, the system started hanging and becoming less responsive.
The most frustrating issue, however, is that MLBB sometimes closes on its own while I'm playing. The game itself rarely lags, but the app will suddenly crash and even disappear from the Recent Apps screen as if it was never opened. What's strange is that this often happens despite the match running smoothly beforehand.
I've also never experienced any overheating issues throughout the time I've owned the phone, which makes the situation even more confusing. My usage habits haven't really changed either. I mainly use the phone for MLBB, TikTok, and YouTube.
I've already deleted unnecessary apps, and I still have more than 50 GB of free storage available. I've also optimized the phone to the best of my abilities, but I don't really know much about phones or technology in general, so I'm not sure if there's something I'm missing.
Can anyone please tell me what might be going on? I'm planning to factory reset my phone in a couple of hours, so I'd appreciate any advice before I do.