We usually wait until the Patch Tuesday updates come out before deploying out
of band updates like those that came out on 9/20. I combined the 9/20 updates
with the full Quality Rollup in one deployment and all updates failed with
error 0x87D0070C, which is basically a timeout. UpdatesHandler log showed
"Automatic Updates is currently busy, failing job".
I'm in the middle of trying different scenarios but so far installing the 9/20
updates by themselves was successful.
More to come...