Sounds as if the ink is drying out in the nib. I would suggest storing the pen with the nib down and making sure that the cap is on fairly tight (keeps the air away from the nib) If the pen should continue to stop writing (and there is ink in it) try dipping the nib in water. That should liquiefy the ink and make it run. This advice is from my husband, who collects and restores fountain pens, and has over 1000 in his collection.
Say, thanks. One time, I dipped the nib into the water and it wrote! Just not so dark since the ink is mixed with water. Thanks a lot.
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