Xiaomi 13T Pro Issues With Calls Battery Overheating and Screen Flickering

I bought the Xiaomi 13T Pro thinking it would be top-notch, but it hasn't quite lived up to my expectations in a few areas. I can't pick up calls when my screen is locked, and the WhatsApp call screen doesn't show up in full-screen, no matter if my device is locked or unlocked. I never had this problem with the Xiaomi models I used before. I’ve got the newest Android 15 and HyperOS 1.4 updates on my phone, but I’m still facing the same problems. The battery runs out way quicker than I thought, the device gets hot pretty fast, and I’ve seen the screen flicker from time to time. The issues with the phone really make it seem unreliable, especially considering how much it costs. I hope Xiaomi sorts these problems out quickly because it’s tough to deal with so many issues on a new device.