Lots of reports that people have lost sync. Just throwing the notice that the network IS stopped. Chiaexplorer also reports the last block being 255108 https://www.chiaexplorer.com/blockchain/blocks
My official unofficial explanation: Bram tripped on an ethernet cable and disconnected something. (Did you know Chia is run from Bram’s Comcast router?)
it was staying at 113 and not showing any block for minutes but now i am at 116. and i am checking my logs that i am not attending any challenges in more than 100 secs.
I recommend you below tool which sends me challange issues via telegram. maybe you are already using.