As mentioned in a prior 3PI-X post, the addition of two capacitors help stabilize the 555 IC from any coil high voltage feedback.
1) Add a .01uF capacitor (10nJ100) at I11-I14 right behind block B2 (pointed to by the longer red line in the photo). There is barely enough space and this must be installed before block B2. If B2 is already installed, try installing it on the bottom side of the PCB (but beware the "letter" coordinates are different on the bottom side of the PCB, B11-B14 to be exact)
2) Add a .1uF capacitor (.1J63) to block B1 positions 1 and 2 (pointed to by the shorter red line in the photo). See the original instructions of you are not sure of the location of the two positions.
As a side benefit, I have discovered that the 3PI-X will operate at 12 volts with the addition of these capacitors. I have not tested the longevity of the module at 12 volts, so proceed at your own risk! Overheating is much less likely if the auto-timeout jumper is enabled (attached), but regardless, check if any components are getting warm or hot every minute until you're confident it's running cool.
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