Try remaking your forwarders and update the forwarder pack.
If the issue persists, delete the first DSiWare title installed, and see what happens when reproducing the issue.
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
If the issue persists, delete the first DSiWare title installed, and see what happens when reproducing the issue.