shuts down all the masternodes
I must've missed this, because my Masternodes are all fine and all got paid within schedule. Sentinel went down, which is a non-critical sub-module added with 12.1 and was easily restarted.
When did that supposed "all masternode shutdown" happen? You sure you aren't confusing this with one of iCEHOLE's autoerotic ejaculative episodes?
On Dashninja.pl it really did look like most of the masternodes were down that day, at least at first glance :
Hell, even i thought most of the masternodes were down, when i created this thread: