First, I have nothing to do with the devs. Just trying to fix the problem as a casual miner. It seems that

-- There's a random "out of memory" error when calling getblocktemplate().
-- Network not accepting mined blocks, possibly due to masternode/budget reward allocation.
-- Blockchain stall at 43200 has broken lot of hard-coded thresholds (like, out of sync if latest block is more than 2 hours ago), so those thresholds need to be adjusted.

I still haven't figured out how those parts work, don't have a working fix