HP Prime Android Application (2016.12.08 1.3.1.11226) is clearing user apps/programs

[Han]

On the hardware, pressing [Shift] [On] does more than turn off the calculator. It saves the memory state (from RAM to flash, if I am not mistaken) so that when you turn it back on, all of your calculations history, programs, etc. are still there.

I do not know if this is behavior is duplicated in the virtual calculators (though your observations suggest that it does more than just turn off the screen). I do know, however, that the virtual calculator is NOT supposed to do a memory reset after closing the app and then at a later point, opening/running it again.