Default release memory after gps use

I had just upgrade my p3600 TIM with the last ita gps rom,it work fine but i notice a problem,when i use gps(gps tuner or even just a gps photo)it use a lot of ram(15 or more megs) and it doesnt freeup after i close application is that normal???any reg key to add/change maybe??couse i got to do a sr after evey use of gps to get again my 30 megs free.
Thanks in advance,Base