My health will stop at 75% or 50% and say it's full for Raid Bosses when I'm at the main Faction Raid Boss screen (with the Info, Boss Select, Summon, Rank, History tabs). It says "Your Health: 00h:00m:00s" until full, while my health bar is at 50% or 75%.

The only way to actually have my health go to 100% is to keep the app open on the actual Fight Boss screen. This might be an issue..........