Pull back the trim in the right hand side of the boot to gain access to the roof control module. Pull the multipin connector and examine all the pins. Clean throughly, then reassemble. Water ingress or even high humidity is a known issue causing these pins to corrode.
My 2011 C70 Solstice was just 4 years old when I bought it as a Volvo Selekt car. After just a couple of months of ownership, the roof started to play all sorts of tricks, finally refusing to open at all. My local dealer (not the one I bought it from) went straight to the control module, cleaned up the pins on the connector which had gone green and bingo - everything was well again.
Worth a look as its very quick and simple.
John
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Past : 96 855 T5 CD ruby red, 98 C70GT T5 coupe Saffron, 04 C70GT T5 convertible Navy
Present : 95 855 T5R Gul Yellow
08 C30SE Lux T5 Polestar
11 C70 Solstice T5 Polestar
19 XC40 T5 R-Design Polestar
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