Chest plateau

For the past 3 weeks my chest workouts have sucked and I have noticed that my bench is stuck at right around 315 - 335lbs. Also, at other workouts I'll drop to under 300. Here is a sample.
4 sets incline barbell
4 sets flat barbell or dumbell
4 sets cable crossovers
4 sets dips
On occasion I will switch the exercise order
Any helpful ideas

this should be in the Workout forum bro, you'd get many more replies there i'm sure.

you posted this is in the wrong forum,

try working diff. exercises into your routine,

http://www.abcbodybuilding.com/exercise1.htm

Thanks.