Mysql server keeps stopping unexpectedly

Mysql keeps stopping every minute, my memory space in good and also the storage

Filesystem Size Used Avail Use% Mounted on

/dev/sda 156G 59G 91G 40% /

devtmpfs 12G 128K 12G 1% /dev

free -m

total used free shared buffers cached

Mem: 24285 1599 22685 0 129 1227

-/+ buffers/cache: 243 24042

Swap: 511 0 511

What can the issue be? i am getting database error very frequently.