I agree that this really sounds like an unusable phone 
Did you consider to go back to version 6 as this version worked stable for you? Information about how to go back can be found e.g. at ✏ Android 7 update: most annoying bugs, FAQ, etc
I agree that this really sounds like an unusable phone
Did you consider to go back to version 6 as this version worked stable for you? Information about how to go back can be found e.g. at ✏ Android 7 update: most annoying bugs, FAQ, etc