(maybe you installed one of the non-stable, nightly builds of retroarch, but there is a fix)
Factor Restore Delete all Internal memory
1. 3.60 firmware, goto henkaku.xyz/go/, run that install "molecule shell", install "vitaRW", now remove the "FEATURE PAGE", install "enso installer", when you run the program it will ask you to "REINSTALL 3.60 FIRMWARE"
2. 3.65 Firmware, (if you had enso installed before after Factory Restore), run PSVIMGTOOLS and install "VITA SHELL" from the "Easy Installer" option, now run the official 3.65 uninstaller, that should solve the problem.
(since you can't just reinstall the 3.65 firmware, you must uninstall "ENSO", then you can upgrade to 3.68 or keep 3.65 firmware, assuming you have not modified any other files outside of ux0, like vs0 or, certain ur0 files, that require a firmware reinstall to fix properly)
3.68 is the most Stable firmware for vita or "H-ENCORE", the reasons is, unless you damage systems files your self, it doesn't rely on a permanent boot installation that requires removal like 3.60 and 3.65, just update. I tested it the hack is good. (Currently don't use "Retroarch" for the Vita) (the "Retropie" also uses "Retroarch", and it plays the games the vita on ps1 doesn't play well, spyro/colony wars/the resolution art packs for diablo/castlevania/alundra, virtually all the full 3D ps1 games play fine, all................games play better on the vita now, that always played well with the current updates though)
3.65 Reinstall Firmware to fix "Retroarch Problem", after you remove "enso", your only choice is to upgrade to 3.68 firmware to install a hack or "H-ENCORE", you cannot downgrade anymore back to 3.60 to install enso, since you have to install the enso hack on 3.65 while you upgraded to 3.65 firmware from 3.60.