I just wanted to chime in that I've played about 3 hours of Platinum on TWiLightMenu v11.0.0, and nds-bootstrap v0.27.0, and I haven't experienced any such freezes. Doesn't really seem to make a difference, but decided to specify this just in case. Tried using different SD cards, different DSi's (one European and one from USA, thought it probably doesn't matter), thinking it might be just an issue with my devices or some other random corruption. Freeze will happen eventually, however going into the underground area accessed with the explorer kit is a surefire way to get freezes.Play a decent amount of time as you would normally do.Boot up any rom (patched/regular/different region/etc.) of any of the main Gen 4 games (Platinum, Diamond, Pearl).The underground area in particular is a good way to test it, as it freezes consistently there.

Game freezes randomly after a certain period of time, and has only happened to me while in the overworld, not while in battle or while viewing the inventory (though maybe that's just being lucky). Game should play as normal without freezes, especially the underground area.

Haven't played any Black/White 1 or 2 or HeartGold and SoulSilver roms, so I don't know if the problem is specific to these games in particular. If this issue only affects a certain game, which game is it? (No CFW) DSiWarehax (such as Flipnote Lenny, Sudokuhax, etc.).

Heartgold ds rom