W124 Electric puzzle..

[Californian SE]

Hey folks.

'88 300E W124 driving along yesterday, and the wipers stopped working. Thinking fuse, I pull up, check fuse (all fine) tap the wiper, with engine running and wipers on the fastest setting and wham, it starts up again. Odd, I thought..

Ten minutes later same thing, except now it won't start again. The motor moves freely, you can move it with your hand, yet there is no response on any setting, even the washers don't work.

Ten minutes later, the windows stopped working, no response from any of the four windows! (I realise now I should have checked the sunroof... and maybe lights?)

As far as I know these are the only things that have stopped.. Anyone ever had a similar issue?? I'm slightly puzzled.

Thanks in advance for any help