As the sun is shining for the first time this year I thought that I would take my newly acquired Z4 3.0 out for a run. All went well and after a few miles I stopped to put the roof down. All was well then the open roof warning lamp came on flashing. It went off when I lowered the windows slightly and went back on when windows raised, when I got home I found that the roof was not fully open and locked, I pushed down on the roof panel and it clicked shut. Any ideas as to the problem? Thanks