According to Neuro Gadget, the "Clash Of Clans" May 2016 update may have added baby Dragon and Miner troops, as well as new spells but players also got more notifications along with the recent update.
These excessive "Clash Of Clans" notifications led to the game being constantly interrupted. To ease the anger of the already frustrated "Clash Of Clans" players, Supercell came up with an idea to solve this problem and "released an optional update that added the option to set notifications timeinterval to 12 hours."