I agree with "reboot your phone if you're having repeated troubles" but not with telling people to clear out the list — sure, there's very little risk of harm to the device, but because people (including authoritative ones) are telling people they need to clear the task switcher out, how many hundreds of thousands—if not millions—of people are spending minutes every day clearing the list out? Not to mention the extra mental "weightiness" to all those people of having one more thing in their lives that's constantly filling with cruft and needing to be emptied?