My grandmother’s phone is acting erratic

It could be hardware related. But to rule out software issues,you can back her phone up to iTunes and save the picures.

First make sure it’s up to date. It could simply be a bug in the operating system(iOS) that perhaps was fixed in a newer update. Try this first through settings,general,software update. If this doesn’t work…..

Now you can reset all settings to see if that works. If not-

Then you can factory erase/reset the iPhone. This can clear software glitches causing this.

then set it up as new temporarily to see if it fixed the issue. If not,you could try a software reinstallation through iTunes.This is more likely to fix software issues.

If nothing works,it sounds to be hardware related. If it’s under its 1 year warranty still or has apple care(probably not), you could take it to apple. But otherwise it’s hardware related.

AGAIN,BEFORE ERASING A PHONE YOI WANT TO BACK IT UP.