Do you know how often this happens? Because the brick risks only happen when installing or uninstalling Unlaunch, and in rare cases, normal usage of the DSi.
v27.3.3 (Final hotfix, hopefully)
What's new?
The SD card checking feature has been removed, as it is not possible to perfectly detect a bad SD card via CID.
Sounds to me like the SD card is dying, because the DSi Sound app shouldn't be corrupting your SD card.
Follow this guide to reformat and check for errors: https://dsi.cfw.guide/sd-card-setup.html
If you tried updating using Universal-Updater, that does not work, as of currently. Please use the manual method instead. (EDIT: Should be fixed as of v27.3.2)
If the issue persists, delete TWiLight Menu++ from the FBI title list, and try installing again. If the issue still persists, please...
v27.3.1 (hotfix)
What's new?
Some A-Data and Lexar branded SD cards will no longer show the SD prompt.
The SD prompt (for bad/fake/untested SD cards) will now only display when first booting TWLMenu++ on DSi. Turning off the DSi and turning it back on will make the prompt appear again.
A new...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi