Unfortunately not just a seasonal response. Per Business Insider this is being reduced along with LA and SEA. They've directly cited the laptop ban as weakening demand
http://www.businessinsider.com/emira...vel-ban-2017-4
Starting May 1, flights to Fort Lauderdale, Florida, will be reduced from daily flights to five flights a week. The airline says it will make the same cuts to its Orlando, Florida, service starting May 23.
Starting June 1 and 2, Seattle and Boston service will be reduced to a single daily flight from two previously. Finally, beginning July 1, Emirates' twice-daily service to Los Angeles will be cut down to a single flight.
"This is a commercial decision in response to weakened travel demand to US," an airline representative told Business Insider. "The recent actions taken by the US government relating to the issuance of entry visas, heightened security vetting, and restrictions on electronic devices in aircraft cabins have had a direct impact on consumer interest and demand for air travel into the US."