Z-Wave Repair Not Working Effectively - Repair Setting SUC Route

I have a couple of HEs, a C4 and a C7; recently one of the Z-Wave switches stopped working on the C4 so I ran a Z-Wave Repair, but almost all devices reported as "Repair setting SUC route" four times before moving to the next device. When I move the switch close to the hub it does work, and I have a Zniffer so I can see the commands are being sent; but if the repair won't work, there is little chance of getting the switch working (other than swap it to the C7, which is the next course of action). These devices are mains powered, so it is not a case of them being excluded from the repair. My questions is, what does "Repair setting SUC route" mean and how do I get round the fact the repair does not seem to be working properly? Below is a screen shot the latest repair currently running:

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