Very disappointing Roborock Saros Z70 experience – FlexiArm failed twice, the second time less than a week after replacement
I purchased the Roborock Saros Z70 as one of Roborock’s premium flagship robot vacuums. Considering its price and technology, I expected flagship-level reliability. Unfortunately, my experience has been very different. The problem is with the side-cleaning FlexiArm / Side Brush Gearbox mechanism. The arm started repeatedly clicking, rotating, retracting and trying again instead of operating normally. Cleaning became inconsistent and the repeated clicking was clearly not normal behavior. I did not simply clean or reinstall the side brush. I personally purchased a complete replacement Side Brush Gearbox / FlexiArm module and replaced the entire original unit. After replacement, the robot initially worked normally and I believed the problem was solved. Less than one week later, the exact same problem returned: repeated clicking, abnormal FlexiArm movement, repeated rotation/retraction attempts and abnormal behavior during cleaning. Having exactly the same failure return so quickly after replacing the complete module raises serious questions for me about the durability/design of this mechanism, or whether another issue in the robot is causing repeated damage to the FlexiArm assembly. This is not an inexpensive robot. The Saros Z70 is sold as a highly advanced flagship product with cameras, sensors, sophisticated navigation and multiple mechanical systems. At this price level, I expected significantly better reliability. What makes this more frustrating is that when the Z70 works properly, its cleaning, navigation and ability to clean under low furniture are genuinely excellent. That is exactly why this repeated failure is so disappointing. A customer should not have to disassemble an expensive flagship robot, purchase a complete replacement module, install it, and then experience the same failure again less than a week later. I have videos and photos documenting the problem, the clicking behavior and the replacement, and I can provide them if required. I am not claiming that every Saros Z70 has this problem. I am documenting my own experience exactly as it happened. I would like Roborock to answer clearly: Is there a revised or improved version of the FlexiArm / Side Brush Gearbox module? Is this a known issue? Why would the exact same failure return less than a week after replacing the complete assembly? After the cost of the robot, the replacement part, and the considerable time spent disassembling and repairing it, I expect a real solution — not simply purchasing another identical part and waiting for it to fail again. If Roborock is willing to address this properly through a permanent repair, replacement unit, or another reasonable resolution, I am willing to cooperate and provide all photos, videos and technical details.