I have had issues since day 1 on two Note 4's. I took the first one back but the replacement phone did it to and I hadn't installed any apps, music or photos. Samsung and T mobile both said they've never heard of this issue and can't help me. My phone freezes up after attempting a screen shot and if I wait, it takes a good ten minutes before the error message shows. As for the screen write being in active apps, no I've never seen it but if I'm don't want to wait for the error message I'll remove all active apps then backspace. It doesn't always work either. Rebooting is the only sure way to unfreeze my phone and sometimes it even gets screen write to work a few times. Samsung keeps selling us defective devices and refuses to take responsibility for it. My Note 3 was stuck in a boot loop and so was it's replacement and again Samsung had never heard of it and couldn't help. Luckily I found help on xda.com.