Since the recent Nether update mobs have been spawing in secure locations with ample lighting. Creepers and other mobs are now apearing inside player built buildings where they never have before. The rate at which the mobs spawn has increased to a point where once a home is clear of enemies the first rooms have enemies again. It creates endless mob clearing and becomes impossible to make any progress in survival worlds that were previously fine.

For example; when outside the typical 3 phantoms will spawn, but when all three have been killed in less than a minute. They will spawn again less than 30 seconds later. There should at least be several minutes between spawns, if they respawn at all before morning.