that you have rechecked the fluid level carefully in accordance with standard procedures (engine running in park or neutral after warm-up to 80C, perfectly level parking spot, time for fluid to get down out of dipstick tube so it doesn't give a false full reading, etc.???

Your symptoms COULD correspond to something as simple as a low fluid level, although there are more serious possibilities, too, such as an error in installing the filter or a defective filter inhibiting fluid flow.

I'd carefully check the fluid level first, and if it's ok, then I'd panic and seek professional advice.