yes a spontaneous fork was found on block 86156 for those who didn't update from wallet-version 0.13.5.7 to latest  0.13.5.8
no big deal
 if someone still have problems with syncing wallet....

look at the steps in here

https://zcoinkb.wordpress.com/2018/05/07/0-13-5-7-nodes-in-expired-status/

greets