In the Ragnarok 2.5 version, memory is an issue, even in DOSBox. Memory is not cleared when loading after dying or giving up, and will eventually run out entirely. To view the current amount of memory:, hit F9:
MEMORY FREE = 78416
Once this number gets below around 43432 (and above 31128), you may want to save your game and exit entirely, juuust in case.