Yes Jan
Move the engine back. The engine exhaust/tailpipe/bellmouth is a venturi airpump. If it works too well the mass flow through the bypass will cause a pressure drop ahead of the intake. Compressor stalls, airflow reduces and excess fuel burns in tailpipe. The flow reverses as power drops and you have what you have.
Curiously most bypass systems are designed wrong. NASA research in early days of turbines showed that a "ejector tube" (bypass) can produce up to 40% more thrust.
But the bypass and inlet volume must be adequate for the increased airflow. Volume immediately ahead of the intake must be as large as possible.
Andre