S70 freezes

Check your display settings on the watch. 

• From the regular time screen, tap the middle button on the side of the watch to open the quick settings menu > Scroll to down the page to the icon titled "Display" and make sure the box is grayed out (if the watch icon in the display box is showing green, then the display is turned off). 
• Then scroll to the top of the quick settings menu and tap the "Settings" box > Select "System" at the bottom of the menu list > Tap the "Display" option in the System menu > Adjust During Activity and General Use options to toggle the "Display always On" as desired to allow for the backlight and display to stay on longer, as well as the wrist gesture features. 

For more info please reference the Garmin Support pages linked regarding the display behavior and settings on the Approach S70: 

• Why Is the Display on My Approach S70 Not Turning On?
• Changing The Display Settings - User Manual (web PDF)