For the past 24 hours, we've been having issues where the server will seemingly just disconnect most people and just become unresponsive.
There doesn't appear to be anything conclusive in any of the logs, however the last 2 times it's gone down, the last thing in the logs are:

System.IO.IOException: Unable to read data from the transport connection: Connection reset by peer. ---> System.Net.Sockets.SocketException: Connection reset by peer
at System.Net.Sockets.Socket.EndReceive (System.IAsyncResult asyncResult) [0x00012] in <ef151b6abb5d474cb2c1cb8906a8b5a4>:0
at System.Net.Sockets.NetworkStream.EndRead (System.IAsyncResult asyncResult) [0x00057] in <ef151b6abb5d474cb2c1cb8906a8b5a4>:0
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.EndRead (System.IAsyncResult asyncResult) [0x0009b] in <ef151b6abb5d474cb2c1cb8906a8b5a4>:0
at Fleck.WebSocketConnection+<>c.<Receive>b__63_0 (System.IAsyncResult result) [0x00017] in <ab99eefdd17e4a4e88de8ba5c29af877>:0

I searched around for these errors, but they just seem to be general C# and Unity errors which doesn't really give me much to go off.

Other noticeable things in the logs are lines that say

[Payback] nexusonline HTTP CODE: 500

Not sure what this relates to though, im not the server owner and i'm not sure if this is a plugin or something else.
I can't really see anything else in the logs that suggests an issue

Anyone have any ideas or suggestions?  We're a community server, so admin only mods, and Facepunch have currently blacklisted us until we can prevent the crashing from happening

Update:  payback plugin was disable and had crashed again last night so not that 

Evostance

Update:  payback plugin was disable and had crashed again last night so not that 

Ever figure this out?