Tonneau hitting issue
I too had the bungee's replaced and the problem appeared to be fixed, but as time went on, it was and it wasn't.
After seven months in storage, I opened the top and the tonneau lid hit the bow. I was surprised as the bungee's were recently replaced, and as I was told, were of an improved design.
To make a long story short, after I took the Z out of storage, at the first opening it hit. I closed the top and immediately opened it again and it did not hit.
I do not open the top very often and I got to wondering if there was some "hydraulic pressure" type of hiccup going on, as it would hit during the initial opening, then I could open and close the top again and again and it didn't hit. It seemed like something internally needed to "be primed" and brought "up to even pressure", or the internals needed to be "balanced out", and as long as that hydraulic pressure or balance was maintained, there would be no hitting.
As an experiment, I decided to purposely open the top once every month, and each time I did it, it did not hit. I'd like to extend that to once every six weeks, then once every two months, and so on until I found the maximum time the top could stay closed before it would hit upon opening. Maybe I'll try that experiment nest season.
The Z will go into storage again soon, then after six to seven months, I will open the top again, and I honestly do expect it to hit on the first opening, but if I make sure I open it at least once a month, I then expect it to not hit until after the next storage period.
The manual says not to operate the top in cold weather, so that tells us that something is either weak or sensitive or both about the functioning. What exactly I don't know, but it does suggest that the operating system is a sensitive one compared to the old style, more mechanical, convertible tops of yesteryear.
The manual also says not to open and close the top over and over again as it would cause an over heating problem somewhere in the internals. That also suggests that the system is a sensitive one, which makes me think that it may be under-built for the job. Not that someone should go through a series of open and close, but the system should be able to handle it regardless. Just a thought.
Another idea I had, but am not going to do, was to store the Z with the top open. That would relax the bungee's and help to identify if it's more a bungee problem than some other internal issue. When the top was first operated after storage, they would be at full, un-stretched, strength. I'd try it but it may set in some ugly creases and may not iron themselves out. I don't think the bungee's are the problem though, I still believe that the problem lies within the balance of the systems internal mechanism.
Well, that's all I got. Not of any actual repair value, but maybe worth mentioning.
My real curiosity is why only some hit and others do not. It appears that most do not hit, and that only a few do.
With the many Roadsters out there, if most did hit, the forum would be flooded with comments, and the Dealership wouldn't be so surprised to hear of the problem, and then have to contact Nissan for repair instructions.
At least my Dealership had no knowledge of the problem, and they're a large Dealership. My Tech is their GTI guy, so he knows his stuff, and he had to contact Nissan for instructions. Just wanted to throw that thought into the mix.
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