I bought my 2018 Thor Outlaw 29H last year and just had a window shade fail last week. I had the shades down while stored and came into the coach with the main big window shade in the living area unrolled, no spring action. So I took it apart and found a small clear plastic piece in the spring mechanism broken. Tried to epoxy it, no-go on that. After seeing a post on another thread here identifying the brand, Irvine Slow Rise, I saw they have replacement spring assemblies available. I called them today and a nice lady answered and took my address to send me a replacement. I was expecting to give her credit card info, and she didn't ask just said she would send one out! Wow, that's product support!
In addition, when I was looking for the brand I came across the post that had the link to the shade adjustment. I checked all mine in the coach and all of them were adjusted so the spring was really tight and the rise was fast. The problem with that is - the spring winds even tighter as you pull the shade down and puts a lot of stress on the little plastic rod piece that broke in mine. Leaving the shade down was leaving it in the most wound-up position and I'm sure that's what lead to my failure. So, I went around and adjusted all my shades for really slow rise (and readjusted the upper stop position) so that minimum spring tension is used to operate it. I suggest if you have the Irvine shades you do the same to avoid premature failure.
The YouTube adjustment videos are here:
Spring tension adjustment:
Stop position adjustment: