Castlevania : POR freezing

I am using R4 SDHC and Castlevaina:POR always freezes after about 10 minutes. Any Ideas?

https://www.romulation.org/forum/index.php?topic=1462.0As our common issues says, freezes has to do with too slow read/write speed. Backup all your files, reformat your memory card and put them back on. If it's still not fixed you'll need to buy a faster MicroSD. PoR is notorious for needing a fast memory card.

Ok but all the other Roms work and don't freeze including the two other Castlevanias.. any chance of anything else?

Backup all your files and format your MicroSD first, as Seph said before you ask about an alternative.