Just on a whim, guys, check something... pull up the carpet under the passenger footwell, pull out the giant foam wedge and get to the battery compartment. Is there water in there?
I ask because a very generous Smart rep here was kind enough to alert us to an issue, and when I dug into it I found my A/C condensate drain hose had a small leak and for some reason the brilliant decision was made to route that hose through the battery well, which has no drain. If you have random electrical issues, I believe the SAM which controls most of the Smart's brainpower resides in that same compartment. Splashing water or vapors can make computer equipment do strange things.
Also make sure the clear plastic straw-like hose is attached at both ends, battery to bottom of well. That drains the trace amount of hydrogen gas generated by the battery.