On Android the whole game is unplayable,not just the Raid Boss but the whole game is constantly lagging and freezing, refund any monies received for gold (i have sent a ticket in about mine), at the least acknowledge that their is a major issue instead of saying that its fixed like you have in another thread.
Fix the issues that are causing lag and then bring the raid boss event back.
Your customers are not stupid, much more of this and the huge revenue you make from gold will suffer.