Were you using the Bulky Cycle (available on some models)?
Cycle time may be longer during water fill when using the Bulky Cycle, depending on the load size. The Bulky Cycle uses a series of fills while agitating. It may appear that there is not enough water to wash a bulky load, but the washer will continue to add water while its sensors monitor the load. It could take up to 10-12 minutes to completely fill.
This process also increases cleaning performance. The benefit in agitating while filling results in improved mechanical action for a wide variety of loads. The Bulky Cycle is recommended for a lot of different types of items (jackets, rugs, comforters, etc.), all of which have different optimal water levels for load motion, depending on load size. Executing agitation during fill improves the washer's ability to reach the optimal wash water level. During the Bulky Cycle, fill will occasionally pause in order for the washer to provide additional mechanical action at a variety of water levels.