New Zerto 9 Error Reporting

I just upgraded my Zerto to Version 9.  It is replicating across a private WAN link to another private site.  Both are VMWare 7.0U2.  Before upgrade had no error reporting of anything.  Now I am getting a warning that the target site disk latency at target is 4ms or higher and has occurred 4 times in the last 22 hours.  The disk is report a latency of 0ms.  The WAN connection can sometimes be flakey, so is this an indication of that versus disk latency?  Again no issues with Zerto 8.5U3, just started with version 9.