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It pops up randomly when I'm using my phone. However, it ALWAYS pops up when I open Google maps. It then seems to emulate a repeated clicking motion, which freezes my phone to the point I have to do a hard restart.
I am using am HTC One m8
(I'm not sure about this but I'm pretty sure I saw a literal mouse cursor come out of the blue dot one day)
I'm naming it the BDOD (Blue Dot Of Death)