My 2009 45000 mile vehicle has had no issues except in relation to me fitting a remote roof control unit. This led me to believe it was the roof (but it wasn't). I contacted the previous owner who said he had never had any roof issues.
I use the roof about 2-3 times per week - car is always garaged. Using the roof less at the moment due to extreme heat we are suffering.
I did change the salmon relays recently and they hadn't been changed since new. I also changed the main battery as any older battery will give electronic issues.