how to fix black screens in lps biggest stars/lps friends ds game?

[GBAtemp]

in lps biggest stars and in lps city/country/beach friends, when i have finished the tutorial in "adventure", i play for a while and if i go in another building, back out of the game, or if i go through a subway, and then start "adventure" up again, it goes to a black screen and it's unplayable. when i put the ds into sleep mode, the lights do not blink and just stay lit. but i feel like the only fix is to wipe my profile and start over again. can anyone help me with this?

Source: https://gbatemp.net/threads/how-to-fix- ... me.644215/