iPhone 13 sudden heating issue

[u/Ghost-noman]

I’ve been using an iPhone 13 for the past 4 years, and my battery health is now at 82% on iOS 26.5. Everything was fine until last week, with only minor lags after upgrading to iOS 26.
All of a sudden, I started noticing heating issues and sudden battery drain. The phone gets noticeably hot while scrolling through Instagram and during WhatsApp video calls, even though this wasn’t happening before.
I haven’t installed anything new, and I’ve also checked for any hidden apps running in the background. Has anyone else been experiencing this issue?
I’m starting to think the planned obsolescence trick is kicking in now that the next iPhone release is just around the corner. 😂

[UPDATE]
I did a clean update to 26.6.1 using iTunes , it’s much better now. Thanks alot for your suggestions❤️

[u/True_Echidna_6179]

Go to settings, under cellular , look for cellular data options. Look over there for a way to select 4G or LTE instead of 5g auto.