For the last several months, I have been in a slump. I mean a serious, mind numbing, critical, why on earth am I still doing this slump.

I am perfectly capable of making good shots, and have done so - sometimes as much as 3 or 4 times in a row... Then I go brain dead, and make really, really bad shots.

Last night, for example. XX - both great shots. Let up, quit concentrating, pull the next shot 4 boards, split. Pull it back together, XX. Throw another pretty good shot, leave a 10 pin. Miss it by a MILE. What in the world is going on?

Most of the time I can read the lane, and know where to play, what hand positions to use, etc. I'm just making really, really, really BAD shots. Like my brain is NOT connected to my body.

HELP!!! Any suggestions would be greatly appreciated!
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If winning isn't important,
why do they keep score?
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Vince Lombardi

The best advice I ever got about bowling slumps was from an old coach and he said that the only way out of one was by going "Back to Basics".  That is by far the best advice I've ever got about this game that I love to hate!
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Evolutionary.  Revolutionary.

jaf, try 444, 461, and 499.
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Retired and bowling on Fixed Income

Being that I have quite extensive experience in slumps and feeling like quitting, I'll give my two cents worth and see what the actual value of it is.  

First, it depends on how much you like to bowl.  People can say "just don't think about it," but no matter what you try, it's gonna bug you until you figure it out.  Believe me when I say I at least understand the bad shot thing.  If you've ever seen someone practicing alone and yelling at themself, I'm sure it's interesting to watch.  Second, it might be something small and insignificant that's affecting you.  Are your feet getting fast?  Are you pushing away at the right time?  Is your arm too far away from your body (that's the one that seemed to happen to me the most)?  Of course I'm not trying to insult your intelligence, I'm sure you've gone through most of these checkpoints already.  

Let me just say that I'm very familiar with how you're feeling.  I flat out gave up on my right hand, and I'm still kinda disappointed about it.  I might suggest finding something to distract yourself in between shots.  I know it sounds backwards, but you've bowled long enough that you have the muscle memory.  Just run up there and throw the ball, and you might stumble over something accidently that you had previously been doing wrong, etc.
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No, really, I like you.  Now, by all means, feel free to go fornicate yourself with a sharp object.