I have two widgets installed Navmin & GPX Importer. Firmware 3.20 introduced 'Improved widget loop by returning to the most recently used widget.'
I'm finding if either of those widgets have previously been the last widget selected & I swipe down from the main dashboard quite often all I get is a white screen with the widget menu bar visible at the bottom of the screen.
Sometimes the menu bar buttons can be selected (which results in a power-down) & sometimes the devices is totally locked up requiring the 10 sec power button press to resolve.