The software update did nothing for the same problem in Lumia 1520.
the touchscreen fix that been rolled out are for single sim variant (RM-1089). dual sim variant (RM-1090) have to wait more time.
I bought this unit and very disappointed in the performance. I hope they rollout the update soon in my country. I already checked the update but it is still not available.
Thank god! Now people can resume "not touching" Windows Phone not because it doesn't work, it's just because it plain sucks.