I have a sky view 1000 in my RV7a. The screen freezes into multi coloured vertical columns of lines and stays like this until I shut it off or sometimes it shuts itself off. When it shuts off by itself it reboots the screen comes on for a few seconds then it goes through the same cycle. This is rather disconcerting when on approach over trees to a narrow strip. This occurred 3 times about 9 months ago after the aircraft had sat in the hangar unused for 3 months. The problem has suddenly come back. The aircraft is flown several times a week at the moment. Serial number 2017.