So my Server http://www.minecraft.net/play.jsp?server=156a342a17c84bf07a100ef1d87db083 is having issues,  The server gets randoms but most of my players claim that they can only connect part of the time ( while the server is up and people are playing in it)

It usually happens when theres like 6 people in it,  Then others claim they cant join or its not online working, which is weird cause theres clearly people in it playing.  Id like to say its just them but its never the same person telling me this.

what is really strange is Once i restart EVERYONE can join and it sucks cause i restart the server once every few hours just to let people in.

My router is port forwarded properly to ( ANY) for both port = 25565 and SQLPort = 3306.

Anyone else having this problem that can shed some light?