Hi!
This may be because the server is reloading but has not shown that on your computer. This has happened to me and after numerous refreshes I have it's just a server reload. Either that or your internet connection is not working well and you may need to look at that (Though I'm no internet technition) Try to connect to the server later; it should work fine.
If this is not the case feel free to PM me about it.
Kind Regards,
MinerGirl x