After having a difficult month, we partially fixed the issues. Script writer was taking too long and timing out. We had to disable IP V6 on the machines, Under the user preferences, the users had to opt out of getting discount coupons / offers and disable sending patient notifications about prescriptions helped with the Script writer. They also worked on compacting the data. It is still slow but workable.
The ability to send ERx for controlled substance within AC is nice. It still does not allow to respond to incoming refill requests for controlled substances.
Happy to report that the version 11.2 has been stable for the past couple of months.