Server Restart = Corrupted Players

Problem:
I restart the server every 4 hours automatically.
It first kicks all the players, 15sec later then does save-all, 20sec later does /stop

Sometimes (about 5%-10% of the time) It seems player data becomes corrupted.
Players inventories can no longer be saved and console spams
[WARNING] Failed to save player data for <playername> <----This is replaced with playername

My theory is that everyone is frantically logging back in and while their doing this
the server is stopping therefore some player data sometimes become corrupted.

Anyone have a solution?

I think what would work best is to prevent people logging back in after I kick them,
Before running the save-all and stop command. Must be some kind of plugin to prevent
users from logging in?

Can anyone help please? I'm having to roll back player data every time this happens

 

What plugin are you using to restart it automatically?

 

Its not a plugin to restart it automatically.
Its ConsoleScheduler plugin to run commands at certain times
It runs the commands in this order

/kickall
/save-all (15sec after ^)
/stop (30sec after ^)

 

And how does it restart the server?
Also, why kickall. Stopping the server kicks em anyway.

 

The server restarts it self when it restarts. Just by editing the .bat
I do kickall before save-all so that it saves them correctly.

Will doing a /stop save the player data automatically? I know that it kicks them obviously but does it save them

 

the server should save it self'? Think it saves it self...I have never got that problem
But isent it bether to us a backup plugin?