another thing to consider is that, if you're doing conventional flat-back
bench press form, you may have reached the maximum your shoulders can handle. with the elbows flared (sticking straight out at the sides), a large part of the load is borne by your shoulder joints and front delts. these are very very weak compared to the
larger muscles of your chest.
consider switching to metal militia format - the elbows are tucked in, which calls in the stronger muscles of triceps and lats as auxiliary support.
i had the same problem when i stalled out at 120 - always, always, always, i would get stuck about a quarter of the way up on the third rep. i switched to MM format and i'm doing much better. my triceps have also gotten a heckuva lot bigger since then, too.