chest!!!!

well I need help. I have been working out for about 2 years now and I have always seen steady gains. the problem I have been having latley is that my flat bench and my max weight on the flat bench have not changed in over 5 months!!!!! my dumbell bench and everything else I do for my chest workout has gone up but not the flat bench!!!??? I need some advice??? and yes I have tried switchin my routine around and nothing is helping.....
any help will be greatly appreciated!!!
Thanx in advance!:lift:

Get somone to help you do some forced reps and negatives...That will sort it out.

thanx guys Ill give try it out next week!!!!