There are few apps which crashes after some extended use and then the wallpaper resets to stock one. I have rooted lollipop os. I have tried those apps on other phones and also on some custom s4 roms and it worked fine.
Have you tried doing a factory reset and checking those apps again? Also, have you tried those apps on resurrection remix rom?
My stock S4 running stock lp rom does not have any crashes . I have only the stock apps installed with a few necessary apps and no games at all . Only one app that crashes on my S4 is amazon and it's pretty regular at crashing .
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Yes tried on clean rom as well. Only certain apps crash mostly which i develop and test but only on my phone.