Having the same issue. Goes for about 10 or so minutes then shuts the wii u down. CBHC. It also freezes up if I try to use any controller other than the gamepad.
Has anyone tried these on GBA VC injects on the wii u? Successfully patched DBZ LoG2, cheats worked when I tested in mgba. Injected the rom for Wii U VC, but when I launch it on the wii u it just freezes and gives a black screen.
Are there any alternatives to retroarch for aroma? I haven't dug into emulation on wii u much since retroarch kinda pales compared to the standalone options the Wii had.