Sketchbook crashes after I've been using it for hours

If you have been using Sketchbook for hours and it crashes, your device may be running out of memory. 

If you're thinking "no my device has tons of memory", you might need to look a bit closer. The amount of memory (RAM) your device has in its specifications is not the same as the amount of memory available at the moment. 

Many devices will pull from storage to support more RAM so devices with too many apps, videos, music, and/or images saved to them will more quickly run out of usable memory. Apps running in the background also use memory. 

We recommend closing unnecessary background apps. You should find Sketchbook - and your other apps - running better.

As for working for hours, save your work, and often!
Working for hours really puts a strain on your device. Performance will start to degrade as a result. 

If you are noticing glitches, use save current sketch as a copy. ‍Glitches usually indicate that your device is running low on usable memory, so save your work, then try to free up usable memory.