No$gba simply crashes during gameplay?
There are a number of different crashes, none with any solutions. If you get a crash with a message somewhere along the lines of ‘Invalid GX command 000000CD’ then the game is unplayable at this stage. If the crash is a ‘microphone wave in failure’ then it’s just a random crash and you should be able to resume playing the game from your last save which has been written to the hardrive. Unfortunately the cause for this crash is not known. There are various threads speculating on various causes or solutions of it but none have proven to be a universal cause or solution…so basically at this stage it’s just a random crash some games get, or rather some people get and others don’t. A game may also crash if you change settings around too often midplay.