This week Disney XD made some adjustments to its mid-afternoon Weekday schedule.
On Monday the network successfully brought back "Gravity Falls" to its 3:30 PM time slot. That day, "Phineas and Ferb" was still airing at 4:00 PM. But yesterday, "Phineas and Ferb" was moved to 3:00 PM, while "Crash and Bernstein" took over the 4:00 PM time period.
Disney XD also made adjustments to its overnight schedule. See "Disney Dominates Midnight-to-Sunrise Lineup Weeknights" and "Kid Vs. Kat Airing Overnights On Disney XD" topics for that information.