My OX system is coming up on 18 months old. It has been nearly flawless in its performance and has around 700 miles on it.
Only real exception is; I pulled the MTB off the wall a couple weeks ago and went for a ride and right from the start of the ride it didn't want to shift down the cassette correctly. One click, nothing. Second click; boom, down two cogs. Shifts up the cassette were fine. It had been working just fine the last ride I had done on the bike.
I fiddled with the digital adjustments, checked the cassette and endcaps for tightness. Adjusted travel end points. Got out the laser and even swapped chains and chain lengths then slapped a brand new chain on the bike. I got out my derailleur hanger alignment tool and checked that as well. Nothing seemed to alleviate the issue. Then I fiddled with the B screw. *poof* instantly fixed. No idea how or why my B screw would have gotten out of adjustment but bringing it "in" about 1.5 turns made everything run smoothly.
Added Bonus; In my searching for a solution, I came across a couple of posts on the WheelTop Facebook group about someone backdooring the system and giving adventurous users more potential adjustments and a high speed/race mode for shift speeds. The fast shifting is IMPRESSIVE to say the least. Where originally the shifts were *fine* about the same speed as my original mechanical SRAM GX system when dialed in just right, now the shifts are downright seamless and as fast as anything I can recall seeing. I ran the backdoor from my PC but it apparently can run on some phones or mobile browsers as well.
Relevant links;
The WheelTop facebook group post with all the information;
https://www.facebook.com/groups/wheeltopeds/permalink/589424673824889The App backdoor website;
https://dreds.jeckyll.net/