Corsa Comfort yr 51

[Lindy66]

Have above vehicle with tri-tonic (is that whats its called) gear box.
Have started to notice when reversing normally I do not need to accelarate as car will creep but not it start to creep and then stop so I have to push down on the accelerator, now same has happened when pulling away stick it in auto and it doesnt move until I push down on accelerator. I always drive in auto mode
Any ideas if its just a normal thing or should it be looked out ?
Someone did suggest due to bad weather we have been experiencing may have water/mud in the brakes .

Thanks