Unolimited, UTime, Playertitles, and XGUI - Try removing one a day until the crashes stop.
Personally, I'd try the following order first to last. UnoLimited, PlayerTitles, UTime, XGUI.
UNoLimited is meant to override Garry's default functions. I could see it perhaps conflicting instead of overriding.
PlayerTitles, well, it's older code and has been modified various times by more than one author I think to make it work with ULib SVN.
UTime and XGUI, well, just saving those for last if the first two didn't help.
Megiddo and Stick will know more about timing within those.