After much speculation about why Van Halen canceled 31 concert dates (most sources said the band hated each other) TMZ are reporting sources close to the band are saying the guys felt like the current schedule was "too much, too fast" ... and they were "losing their focus."

One source said, "They're simply burned out" ... adding, "They want to make sure their concerts are not a routine ... they want every performance to be special."

The band want to take some time to "re-charge their engines" ... so they can rock all 31 cities the way Van Halen fans expect to be rocked. 

As for the rumors that Eddie and Dave are feuding ... "It's total B.S."