OK, I find this terribly interesting. It's a reply to htc evo 814 in response to his issue about Sense restarting - a related action, because in that case, Sense is bailing to make room for apps, instead of vice versa.
I would first recommend that you check a few settings on your phone. Go into settings>developer options and under Application settings make sure Don't Keep Activities is unchecked and Background Process Limit is set to use the Standard Limit option. Once this is done, restart your Evo 46 LTE by holding the power button and choosing restart.
Does that mean that there is an easily accessible way to tune it??