New MTM 14.5001 foaming issue

anyone else having trouble with the foam cannon? model 14.5001

i add about 4-5oz of soap and some warm water. start spraying it comes out real thick for only about 10 seconds then it only comes out very runny soap. for some reason it does not stay consistent with thick foam. not sure why this keeps happening. if i stop and add a lot more soap it will do the exact same thing. kinda bothering me too, soap being used is adams polishes blue soap, but seems to be consistant with any soap i try in there

pressure washer is a 2800psi 2.3gpm