Hi Guys,
First, let me say that I know nothing about the L cars- that being said, I had a similar problem on a car of mine, and it turned out to be low voltage output from the alternator. I was devilish to find it, but apparently, these computer cars are very voltage sensitive- a drop and they start to act up.
Don't know if this is at all helpful, but thought I'd mention it.

Hi NG51 and thanks for the suggestion. I checked the alternator early on and it read in the correct range. I would never have suspected it on my own but someone else mentioned the same thing.