Help with MacBook Pro Random Crashes

[TChamp]

I know this is probably worn out by now, but for the last month my Macbook pro has been crashing several times a week and lately several times in a day for no apparent reason. Some times it just simply freezes, sometimes it has what I believe is a karnel crash and others it simply restarts itself. I have heard it is due to the seagate hard drives or something, I really know very little about the workings of a computer but I believe my Hard drive model # is ST98823AS is this bad, any help fixing this issue would be greatly appreciated.