Intermittent wind sensor

[HunterWanderer]

I keep loosing the signal from the masthead sensor. It's a Navman 3100s.
The mounting block at the top of the mast has a 5 pin din socket and the sensor plugs into this and then has cover that screws the sensor to the block.
I've been up the mast three times now. Once to spray with WD40 and then twice more to remove the sensor clean it and replace.
I get a signal for hours sometimes but then only for minutes at other times.
I think it is a poor connection of the 5 pin din.
Any suggestions?

 

[bobgarrett]

I don't think WD40 is going to help as it may leave a deposit making it worse.
I had a similar problem (not same device though) and used switch cleaner (aerosol) and plugged it in and removed it a few times to give some friction to clean up the pins/socket.
It might also be worth checking the problem is not somewhere else like the bottom of the mast.