I had to look up NAN to begin with 
Iām not sure, if my reply is helpful at all, but I thought it may be worth a try. My latest patch uses 3 Complex Simpler sampler modules and tends to āget stuckā shortly after being loaded every once in a while; roughly every 5th to 10th try. It was stuck as in: the output was silenced and the output lines showed bright yellow non-flickering lights. In this case the patch could not be reset other but loading it up again. Once the patch was running it didnāt get stuck even once.
I couldnāt figure out what caused this āgetting stuckā, but it may have a connection to the above mentioned phenomenon.