It does sound strange,are you using the brown rice button?

A rice cooker will switch itself off so I’d say you have the water levels wrong. It is always 1 part rice with 2 parts water and you cant go wrong . I use the finger trick which never fails . Put your middle finger IN the rice and use your thumb to measure the level , don’t take your thumb off . Then using same finger put it ON TOP of the rice and that is how much water you should have ( ie this will double the quantity of water ). Let the cooker do its work and when stopped , it will be perfect rice .

maybe it is getting a tad overcooked therefore sticking.

Have you still got your instruction booklet? it might say the different water levels required for brown rice.

We always still use the 1 rice to 2 water method… still works fine with brown rice in the cooker.

I always put the rice in and then put in the water until it’s about an inch from the top of the brown rice. That always works for me.