Before doing anything else remove the negative battery cable were it is grounded to the cars fender and clean that area.
Have you scanned the car for diagnostic codes?
If you are still using the original RCM that came with the car when new, then yes, send your RCM to tighed1 for refurbishing. At this time in it's life new contacts are a good place to start and tighed1 will correct that. After installing the refurbished RCM and the problem persists you can further delve into the problem; perhaps the pulse module.