Inlet Filters
A redundant point, as a washer will fill until the Pressure Switch is satisfied. Some might complain of "No Water" though, but that doesn't seem to be happening here.
You may find the adjustment for the switch has gone bad over time (if there is one), the switch is going bad (or the hosing to it) or your computer module might not be getting the correct readings from the switch.
Has the machine produced any error codes? Are other cycles still filling to the levels they always have?