LTC3300 discontinuous balancing

Dear madam/sir

Working with our design using the LTC3300 we observe the following behavior:
after sending the start cell discharge command, the gate drivers are only switching for a short amount of time, before stopping.
After a certain timeout switching starts again and so on...

The primary and secondary on times correspond to the values set with RTONP and RTONS,
and from the average current measurements, the discharge current seems to correlate with the theoretical discharge current, accounting for the low duty cycle, as shown in the picture.

The cells have 10uF bulk capacitors present on the PCB and the behavior was tested with the watchdog functionality disabled as well.

What would you suggest as possible causes of this discontinuous balancing?
Any help is appreciated,
Dusan