EDIT: Here's a much better thread by Gluttony explaining the same issue: http://www.spacetimestudios.com/showthread.php?58218
There are times where I'll be clearing out the breakables or dead bodies after beating a boss, but I won't have a chance to because the glyph-out will activate and trigger before I can finish. This will happen almost instantly and won't even require the bar to fill up completely.
Ways I see this happen the most are when there is a body lying close to the glyph and I search it while standing in the circle. The activation of the body instantly trigger the level out and causes the map end pop up.
Other times it just happens randomly. This is annoying because I cannot see what I'm doing once the pop up appears.
A way to solve this - have a pop up BEFORE starting the count down asking if we'd like to leave the map.
Happens on both Chrome and on my Android Phone.