iPhone 6s Constantly Glitching and not working

I bought a Rose Gold 128gb Iphone 6s a year or so back and had contant battery problem and had it replaced but since the new updates my phone has been glitching and not working right. I even restored my phone to factory settings and cleared everything. These are some of my problems:

Screenshots don’t come up

Music is playing but the time stays at 0 for the whole song

Won’t let me unlock the phone sometimes - result doesnt show time

My imessages and normal messages send a lot of times even a few hours after

Imessages are sent wierd and there response comes before my text

Always glitching with wifi and sometimes not connecting

Constantly freezing and won’t turn off

Some of my apps such as messages and music turns grey when im not using it

Constant glitching in apps

Turns black and a loading wheel comes on the screen

Thanks anyhelp would be great