[Can't change bed and nozzle heat temp and make it stay....]

I've changed the bed and nozzle temps every where I could in the software (printer settings, material, etc) and I finally got the bed to heat to the temp I wanted (50º) and the nozzle (220º), but then a few layers in, the temp jumps to the default 70º (which is way higher than I need) and the nozzle temp drops to the default 215º (which isn't as bad because it still prints)...

 

help please!

 

thank you

[Cura 2.1.2 -- how to change a removable drive?]

When I click save to removable drive, my software does nothing.... help!! please??

I get an empty box on the bottom of the screen with an "X" in the upper right corner

2.1.2 on a MAC with a Malyan M180