Hi gpdorward,
I also have a programmable shunt, and it is also a strata valve.
I have rest my shunt once before by going too close to a car subwoofer. At first my neurosurgeon told me to keep away from any EMF's, but after he consulted several specialists they came to the conclussion that I only need to stay away from strong EMF's near my head. The 3 things I was told not to go near are MRI's (as you already know), subwoofers, and large earphones (earbuds are okay). I have listened to their advice and have had no trouble since!
Hope this helps.