Bit of a puzzle, click when driving then electrical issues

Hi, I'd love some guidance on this one.



I posted previously about a barrage of electrical issues eg remote door lock fails, indicator IPK lights not working etc but thanks to advice on here I found standing water in the plenum chamber and drained it.



Now things are much better but I hear a click when driving sometimes then the ac will show 'er' message and the radio will stop working. This will only last for about 5 secs then things will come back to normal...



What do you think? A short of some kind, or a power drawing problem?



1.8T 75 tourer, conni, HL nav, 2003.

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