Pix 515-E running V7.1.2 had stopped forwarding trafic 3 times over a 4 weeks period since first installed.  When problem happened, it can not be ping or ssh to, it stopped traffic going across it.  Console still works.  Restarting the box would fix the problem tempoparily.  I managed to get a show blocks while there was problem as shown below.  The line 1550 block does not look right.  Can anyone confirm if problem is related to V7.1.2?
------------------ show blocks ------------------
  SIZE    MAX    LOW    CNT
     4    300    298    299
    80    100     97    100
   256   2124   2080   2124
  1550   1935      0      0
  2048    100    100    100
  2560     40     40     40
  4096     30     30     30
  8192     60     60     60
 16384    100    100    100
 65536     10     10     10