Gentlemen,

Yesterday I pulled out each fuse and visually checked for any burn marks or breaks/opens (fuses behind the left side dash). I found that all fuses looked ok. I was thinking of metering the fuse terminals later on checking for continuity due to hairline cracks. I then used the remote to lock the doors and it's working. It's still working fine this morning (next day). I'll let you know if it acts up again. Hopefully it was just a case of corrosion.

Thanks for the replies.