I'm with you, it looks like the patch has been applied to my HH% too but wireless devices are constantly struggling to connect, no problem with wired devices at all, also, my connection has been solid at 76-79mb for the last 13 months and since this update it has dropped to 61-62mb.
I spoke to BT (India) on Monday night, they checked the line and router and both seem fine, they will monitor it!!!
I'll be calling back tonight I think.