Communication Link failure from all Java Applications

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http://serverfault.com – We are seeing "The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server" exception from all of our java applications at a time. And this is happening after every 3 or 4 days. We tried pinging the host where mysql runs, some times it works some times it wont. Client side we are using "Commons GenericObjectPool" and mysql driver version is 5.1.22. and commons dbcp version is 1.2.2. When ever we see this issue we are just restating the network on host where mysql runs. Now i am in a confusion that, is this issue from applicati (HowTos)