Hi gairec and welcome to the forum!
Running o.k. for about 3 months then the wind data went away suggests one of two things to me. 1. Your console/display has recently been subjected to RF interference such as a wireless lan access point/router, cordless phone, etc. This can cause the wind data section to drop out., or 2., Your wind sensor has a seal leak and got wet inside which many folks with this model have experienced. I hope it the first, interference.