My phone (Samsung Galaxy A03s)is not working properly with apps on internal and external storage for some reason the apps are gray color and saying that they aren't install on my devices. It's been happening a lot lately after charging my phone to battery charger, and when using a USB charger cable on my car to charge it. I didn't have this problem couple months ago after purchasing my phone.
make sure the phone is up to date
are you in safe mode by any chance?
take it to the nearest service center if you can't figure out what's causing the issue