I don't think it's a singular play, and I don't think the sack numbers are ALL on offensive line play.
The sack problems seem to boil down to these three interdependent issues:
1) The OL does not always hold a block long enough. Not sure if this is an OL problem or a management problem because...
2)...QBs take a long time to make a decision. They miss open underneath routes because they take too long to go through their progressions. Since you can't expect the OL to hold a block for 5 seconds, by the time most QBs have made their reads and decided to throw the OL block is breaking down...
3)...and QBs are forced out of the pocket. Plays where a QB is forced out of the pocket will result in a sack 90% of the time because...
3.a) QBs do not scramble upfield and...
3.b) QBs do not throw the ball away fast enough.
The root cause of the problem seems to be how slow it takes QBs to make their reads and throw. A problem that is compounded and frustrated by the fact they miss so many open WRs despite taking 5-10 seconds to decide when to throw. And when they don't throw and decide to scramble, then they don't run upfield which shuts down drives and inflates sack numbers.