I've been having problems with my ZTE Blade Xmax. When I have more than one or two apps open, it will often freeze and I have to restart. I mean, seriously! I had a ZTE Zmax 2, which cost half as much, and I never had this problem on that phone! I think this must be because of a system update, since I didn't used to have this problem. This is the second time an update has caused major problems for my phone. (It happened with a Moto G4 as well, and there was nothing I could do about it because it was the Amazon Prime edition.) How can I change it back to Android 7.0? Will a factory reset do the trick? If this can't be fixed, I'm switching to iOS. Which is something I've said I would never, ever do, but at least I can count on the quality, even if it will be inconvenient because I use Linux on my computer. I've had this phone for less than two months, so this is ridiculous.