Problems Shenmue 2 and ide-cf mod with dreamshell

[Lisko]

Hi, I recently purchased my first dreamcast from ebay with picopsu mod, compact flash ide mod, bios chip replaced with a flashable one and currently running dreamshell's bootloader. I purchased a sandisk ultra 16gb (333x 50MB/s). All seems to be fine, tried a lot of games and works well even in true dma mode and is pretty fast. I was playing shenmue 2 with widescreen hex patch and I'm currently at disc 2 when you go to warehouse no. 8 to enter Beverly hills wharf. After the second battle that you have to mandatory loose you will wake up in wong's boat. After sleeping starts a cinematic surrounding the zone but at some point video and audio hangs and console freeze. I tried also with "vanilla" gdi, a cdi version, switching off dma, playing with emu async sectors and tried loader 0.6.6 and nothing: it freeze always at the same point. Now I can only burn a cdi version only to pass the cinematic. Since shenmue 2 is given fully compatible, did someone played the whole game from ide? I also have another problem: as said the cf seems to work well and pretty fast but if I try to write to it from dreamshell for backing up saves or save a preset the console hangs and after a reboot sometimes I have a file with right name but 0 byte and sometimes completely mess the file system and I have to reformat so my dreamcast can access the cf in read-only but as said all games seems to work fine except for shenmue 2. Hope the two issues are not related. Thank you all for your responses.