hey so heres all i can fathom on this error...
it seems memory card based not hack based. i've read it can be corrupted save files and your best chance is to back everything up and format the console and then restore. or seemingly preferably get another vita card as the feeling online seems to be dying memory card or rouge save file.
however if you get to a point where you cant do anything format wise the only thing ive ever heard is to hold the memory card in fully and boot up the system although even as in typing it doesn't sound likely to help.