More than likely you over trained. I would do one of the following. The first one would be bench every 10 days. Or split your chest routine into twice a week. Flat bench one day, incline the next. Or substitute dips for flat bench for a couple of weeks. Without seeing you, it could also be mental as well. So a breakup or increase in time between bench sessions would help in that area as well.
Going with a heavier weight as suggested could also benefit as well and not a bad approach. You could also drop one or two sets from your routine as well. I wouldn't go with lighter weight higher reps. The problem is if your over trained, you will only further the recession. But I think splitting you chest routine will also help your incline.
Also if you are newcomer, less than 3 years steady, training your arms twice a week like that also will retard growth or cause sticking points to happen more often. It sounds like to me you have a typical case of being over trained. Rest and doing a little less for a bit can do wonders all around

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