L322 suspension issue

hi guys bit of a strange one, when firing the car up it has decided over the last few days to light up the suspension height lock switch, it seems to do this for the first couple of mins or until i start to drive off. any ideas why it should be doing this? it's a 2003 l322

Weak battery?

battery is fine, it's holding charge with no problems it's certainly a strange one though, it did it earlier in the year as well but cleared after a few weeks. but it does seem to relate when it's wet/ raining. it usually will also trigger suspension inactive, which always gives an error code on the ABS no signal from ride height, as well as a suspension error which i think was a sporadic fault. i'm thinking possibly suspension ecu got wet?

or sensor wiring connections

yes it could be that last time i checked the rear sensor wiring the backs of the connectors were covered in mud & crud they could have clogged again, i might look at replacement connectors and try to get some rubber boots on them to keep the crap out