For the moment at least, though nothing is really concrete whether these issues can be mitigated through software/firmware updates.
EZTeam's support is typically pretty ok (from what i've read around)
I'm having a similar issue too, games like Pokemon Emerald and Sonic Adventure 2 save just fine, if I try saving in say M&L or DKC it'll fail, sometimes it might succeed if I try saving a second time. However if I try power cycling the GBA where it then backs up the save and then try opening the...
I just had a quick listen to the soundtrack for Persona Q again, and the only track I find sorta good(ish) for a battle sequence would be 'Light the Fire Up in the Night - Midnight Channel' (at least I think thats what the song is called according to this music site).