Static charge on the case? Disassemble and wash carefully with fine dish soap. Dry carefully with a paper towel and let it set a day until all moisture is sure to be gone. Take precautions not to build up another charge when reinstalling.
You might just wipe the face carefully and see if that has any effect but if it has a big charge built up, you may have to mproceed as above. 73 and Happy New Year. John, W45AWM
