Board Thread:Help Board/@comment-177.19.99.171-20151125000509/@comment-112.209.19.13-20151125154728

Nope, the effects will reset per floor. If you see some characters retaining certain buffs it could be the effects of a sphere or their Extra Skill. Basically if that screen with the bar indicating what floor you advance to pops up the effects will reset :D.

Do not confuse this with special consecutive battles though. In cases such as Trials, (Maxwell, Lugina, Seria etc) GGC, and some in GQ the battle will continue after you kill the enemy and will retain the effects on your team