This problem happened back in late September and a factory reset was my only course of action. Looking for suggestions of something else to try.
At random the phone will freeze. After a few seconds the phone vibrates and indicates that the home button (or something in the area of the home button) has been pressed - i can see the waterdrop circular effect happening too. However I have not pressed anything. Most of the time it just closes the open app and returns to home screen and will not allow anything to be selected unless the screen is turned off/on - however if no app is open when this "press" occurs, the phone or text message app may be opened instead and still freezes
This happens once or twice at first but then the button press event happens so much the whole phone freezes and it has to be powered down. Once the phone is turned back on it happens again.
I have not recently installed any new apps.
A factory reset is what helped rectify this the last time it happened (late September). But it's very frustrating to have to factory reset a phone twice in less than 3 months.