Hey there, all these issues sound like you’re out of storage on the device, or that the devices thinks it is and isn’t managing resources properly. You can probably resolve all these issues if you erase the device and set it back up. With “one home-screen” it’ll download your apps again. You’ll have to sign back in, but I bet it solves your issues 100%.

I have the same model as you and the device is running really well. Probably worth a shot!