SVM Scikit-learn creation question

Background / Question

I am trying to create a SVM using Scikit-learn. I have a training set (here is the link to it https://dl.dropboxusercontent.com/u/9876125/training_patients.txt) which I load and then use to train the SVM. The training set is 3600 lines long. When I use all 3600 tuples the SVM never finishes training.... BUT when I only use the first 3594 tuples it finishes training in under a minute. I've tried using a variety of different sized training sets and the same thing continues to happen... depending on how many tuples I use the SVM either trains very quickly or it never completes. This has led me to the conclusion that the SVM is having difficulty converging on an answer depeding on the data.

Is my assumption about this being a convergence problem correct? If so, what is the solution? If not, what other problem could it be?

My Code

import pylab as pl  # @UnresolvedImport
from sklearn.datasets import load_svmlight_file

print(doc)
import numpy as np
from sklearn import svm, datasets
print "loading training setn"
X_train, y_train = load_svmlight_file("training_patients.txt")
h = .02  # step size in the mesh
C = 1.0  # SVM regularization parameter
print "creating svmn"
poly_svc = svm.SVC(kernel='poly', cache_size=600, degree=40, C=C).fit(X_train, y_train)
print "all done"