IHD not connecting to wifi

My IHD unit will not conect to wifi. Nothing has changed with its position just stopped connecting. I have reset the IHD , I have reset the router, I think the IHD is one of the early ones that experienced problems. For the record the unit is the chameleon oc-A2-F4-00-00-3F-21-F8 with softare version IHD6-CAD-PPMID 1.4 CAD 1.9. The signal stregnth is 5 bars , full house, but is continuiusly flashing as is the wifi icon