Hi,
Just thought I'd share this since I found no solution to my problem after extensive searching.
I am using a Yun which drives a stepper motor using a timer triggered interrupt. I am also reading an analog value at each step and sending data to a PC via WIFI. I was using the analogRead() function in the interrupt routine and found this caused the wireless communication and presumable the Bridge to become unstable, i.e., it would hang for a quite a few of seconds quite frequently. I found that this was due to the analogRead() function, presumable since it takes 100 microseconds.
I solved the problem by using interrupt driven analog conversion with the help of the following tutorial :
Mike