It seems that when pump rotation is not entirely blocked but only obstructed, E25 is signaled only on end drain cycle and not on other drains between washing program.
The control board circuitry measure pump electric current load and when exceeded for any reason, it signals E25.
In my case blockage was built from bucket of fibers and/or hairs around steel axis just under impeller caused pump motor needed more power to turn and escalated current.
I couldn’t even imagine how many fibers manage winded around steel pump axis in 7 years and breaking rotation and escalating pump electric current load.
I remove pump after opening down front of dishwasher. After pull impeller together with fix magnet rotor and rotor cover from pump. Then carefully clean axis between impeller and front rotor cover with forceps in small sharp knife.