At block 721000 a hardfork will happen. Please update your daemon to 2.1.0 from https://github.com/deroproject/derosuite/releases
GUI wallet users do not need to update it.
Major change that concerns miners and investors: side block reward will decrease from 67% to 8%.
Changes are listed here: https://github.com/deroproject/derosuite/commit/05081d365b991914748d151f0f25ca5dd19f47cc