For your 2016 Thor Tuscany 34ST slow-rise shades, the main issues are typically caused by worn springs and damaged brackets. The shade that won't roll up likely needs a replacement spring inside the roller tube. Most premium slow-rise shades use a 1.25" roller tube spring, which can be ordered specifically for your shade size. The bracket with the broken plastic piece should be replaced to secure the shade properly; you may need two brackets if the other shade shows similar wear. Additionally, if the shade won’t stay down, resetting the gears may help, but if that fails, replacing the spring or the entire shade assembly is advisable. Consider replacing the entire shade for a fresh, fully functional setup if multiple parts are failing. You can find these replacement springs and brackets at Elkhart RV Parts' website under RV pleated and roller shade components.